The Project Gutenberg EBook of A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope, by John D. Lynch This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org Title: A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope Author: John D. Lynch Release Date: October 21, 2011 [EBook #37809] Language: English Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK A TAXONOMIC REVISION OF THE *** Produced by Chris Curnow, Tom Cosmas, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net UNIVERSITY OF KANSAS MUSEUM OF NATURAL HISTORY Vol. 20, No. 1, pp. 1-45, 22 figs. February 20, 1970 A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope BY JOHN D. LYNCH UNIVERSITY OF KANSAS LAWRENCE 1970 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors of this number: Frank B. Cross, Philip S. Humphrey, William E. Duellman Volume 20, No. 1, pp. 1-45, 22 figs. Published February 20, 1970 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY THE UNIVERSITY OF KANSAS PRINTING SERVICE LAWRENCE, KANSAS 1970 A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope BY JOHN D. LYNCH INTRODUCTION Cope (1878) proposed the genus _Syrrhophus_ for a medium-sized leptodactylid frog from central Texas; in the ensuing 75 years the genus was expanded to include a heterogeneous group of frogs ranging from Texas to Peru. Taylor (1952) and Firschein (1954) limited the genus to several species of frogs occurring in Guatemala, Mexico, and Texas. Lynch (1968) provided a definition of the previously loosely-defined genus. With the exception of Taylor (1952), who treated the Costa Rican species, none of these authors dealt with the present status of the nineteen species erroneously assigned to _Syrrhophus_. These species are listed in Tables 1 and 2 with the name currently applied. Some of them are new combinations and their justifications will be published elsewhere. Gorham (1966) is the most recent author to include South American species in the genus _Syrrhophus_. Smith and Taylor (1948) recognized two species groups of the genus in Mexico, an eastern and a western group (here termed complexes for purposes of discussion), separated on the basis of the number of palmar (metacarpal) tubercles (three palmar tubercles in the members of the eastern complex and two in those of the western complex). Duellman (1958) reviewed the species of the genus occurring in western Mexico and concluded that there were five species (two polytypic). Dixon and Webb (1966) described an additional species from Jalisco, Mexico. The distributions of some species have been extended, but otherwise the western complex of species remains unchanged since Duellman's review. Smith and Taylor (1948) recognized seven species of the genus in eastern Mexico. Firschein revised the eastern complex (as then understood), and in so doing added one new species and treated _Syrrhophus verruculatus_ as a _nomen dubium_. Dixon (1957) redefined the related genus _Tomodactylus_ and transferred _T. macrotympanum_ Taylor to the genus _Syrrhophus_. Neill (1965) described a new subspecies of _S. leprus_ from British Honduras. Two species (_S. gaigeae_ and _S. marnockii_) were recognized in Texas until Milstead, Mecham, and McClintock (1950) synonymized _S. gaigeae_ with _S. marnockii_. Thus, at present, nine species (one polytypic) are recognized on the eastern slopes and lowlands from central Texas to British Honduras. These are currently placed on one species group equivalent to the western complex reviewed by Duellman (1958). TABLE 1--Species Described as Members of the Genus _Syrrhophus_ but Now Placed in Other Genera. ======================================================================= Trivial name and author Current combination ----------------------------------------------------------------------- _areolatus_ Boulenger, 1898 _Eleutherodactylus areolatus_ _calcaratus_ Andersson, 1945 _Eleutherodactylus anderssoni_ _caryophyllaceus_ Barbour, 1928 _Eleutherodactylus caryophyllaceus_ _coeruleus_ Andersson, 1945 _Eleutherodactylus coeruleus_ _ineptus_ Barbour, 1928 _Eleutherodactylus diastema_ _juninensis_ Shreve, 1938 _Eupsophus juninensis_ _lutosus_ Barbour and Dunn, 1921 _Eleutherodactylus lutosus_ _molinoi_ Barbour, 1928 _Eleutherodactylus molinoi_ _montium_ Shreve, 1938 _Niceforonia montia_ _mystaceus_ Barbour, 1922 _Eleutherodactylus rhodopis_ _obesus_ Barbour, 1928 _Eleutherodactylus punctariolus_ _omiltemanus_ Gunther, 1900 _Eleutherodactylus omiltemanus_[1] _pardalis_ Barbour, 1928 _Eleutherodactylus pardalis_ ======================================================================= [1] New combination. TABLE 2--Species Incorrectly Regarded as Members of the Genus _Syrrhophus_ but Described as Members of Other Genera. ========================================================================== Trivial name, original generic assignment, and author Current combination -------------------------------------------------------------------------- _chalceus_ (_Phyllobates_) Peters, 1873 _Eleutherodactylus chalceus_ _festae_ (_Paludicola_) Peracca, 1904 _Niceforonia festae_ _hylaeformis_ (_Phyllobates_) Cope, 1875 _Eleutherodactylus hylaeformis_ _palmatus_ (_Phyllobates_) Werner, 1899 _Colostethus palmatus_ _ridens_ (_Phyllobates_) Cope, 1866 _Eleutherodactylus ridens_ _simonsii_ (_Paludicola_) Boulenger, 1900 _Niceforonia simonsii_ ========================================================================== TABLE 3--Nominal Species of _Syrrhophus_ (_sensu strictu_) and the Name Used Herein. ======================================================================= Original combination Current combination ----------------------------------------------------------------------- _campi_, _Syrrhophus_ _cystignathoides campi_ _cholorum_, _Syrrhophus leprus_ _leprus_ _cystigathoides_, _Phyllobates_ _cystignathoides cystignathoides_ _dennisi_, _Syrrhophus_ _dennisi_ new species _gaigeae_, _Syrrhophus_ _guttilatus_ _guttilatus_, _Malachylodes_ _guttilatus_ _interorbitalis_, _Syrrhophus_ _interorbitalis_ _latodactylus_, _Syrrhophus_ _longipes_ _leprus_, _Syrrhophus_ _leprus_ _longipes_, _Batrachyla_ _longipes_ _macrotympanum_, _Tomodactylus_ _verrucipes_ _marnockii_, _Syrrhophus_ _marnockii_ _modestus_, _Syrrhophus_ _modestus_ _nebulosus_, _Syrrhophus_ _pipilans nebulosus_ _nivocolimae_, _Syrrhophus_ _nivocolimae_ _pallidus_, _Syrrhophus modestus_ _pallidus_ _petrophilus_, _Syrrhophus_ _guttilatus_ _pipilans_, _Syrrhophus_ _pipilans pipilans_ _rubrimaculatus_, _Syrrhophus_ _rubrimaculatus_ _smithi_, _Syrrhophus_ _guttilatus_ _teretistes_, _Syrrhophus_ _teretistes_ _verrucipes_, _Syrrhophus_ _verrucipes_ _verruculatus_, _Phyllobates_ _Nomen dubium_ ======================================================================= In the course of preparing an account of the species of _Eleutherodactylus_ occurring in Mexico and northern Central America, it became necessary to reexamine the status of the genus _Syrrhophus_ and its nominal species. It soon became evident that there were more names than species, that some previously regarded species were geographic variants, and that the eastern and western groups (complexes here) were artificial divisions of the genus. I conclude that there are seven species (one polytypic) of _Syrrhophus_ in eastern Mexico, Texas, and El Peten of Guatemala, and seven species (one polytypic) in western Mexico. The current status of each of the 23 names correctly assigned to the genus is presented in Table 3. The fourteen species recognized by me are placed in five species groups. Two of these groups are presently placed in the western complex (_modestus_ and _pipilans_ groups) and three in the eastern complex (_leprus_, _longipes_ and _marnockii_ groups). The two complexes do not correspond exactly with the eastern and western groups of Smith and Taylor (1948), Firschein (1954), and Duellman (1958) since _S. rubrimaculatus_ is now associated with the eastern _leprus_ group. The definitions and contents of the five species groups are as follows: _leprus_ group: digital pads not or only slightly expanded, rounded in outline; first finger longer or shorter than second; snout acuminate or subacuminate, not rounded; outer metatarsal tubercle conical; digits lacking distinct lateral fringes. content: _cystignathoides_, _leprus_ and _rubrimaculatus_. _longipes_ group: digital pads widely expanded, triangular in outline; first finger shorter than second; snout acuminate; outer metatarsal tubercle not conical; digits bearing lateral fringes. content: _dennisi_ and _longipes_. _marnockii_ group: digital pads expanded, rounded to truncate in outline; first finger equal in length to second or slightly shorter; snout rounded; outer metatarsal tubercle not conical; digits lacking lateral fringes; generally stout-bodied frogs. content: _guttilatus_, _marnockii_, and _verrucipes_. _modestus_ group: digital pads expanded, truncate in outline; first and second fingers subequal in length, first usually slightly shorter than second; snout subacuminate; inner metatarsal tubercle twice as large (or larger) as outer metatarsal tubercle; digits bearing poorly-defined lateral fringes. content: _interorbitalis_, _modestus_, _nivocolimae_, _pallidus_, and _teretistes_. _pipilans_ group: digital pads not or only slightly expanded, truncate in outline; first finger equal in length to second; snout subacuminate; metatarsal tubercles subequal in size; digits lacking lateral fringes. content: _pipilans_. _Acknowledgments._--For loan of specimens, I am indebted to Richard J. Baldauf, Texas A & M University (TCWC); W. Frank Blair, University of Texas (TNHC); Charles M. Bogert and Richard G. Zweifel, American Museum of Natural History (AMNH); James E. Boehlke and Edmond V. Malnate, Academy of Natural Sciences of Philadelphia (ANSP); Robert F. Inger and Hymen Marx, Field Museum of Natural History (FMNH); Ernest A. Liner (EAL); Michael Ovchynnyk, Michigan State University collection (MSU); James A. Peters, United States National Museum (USNM); Douglas A. Rossman, Louisiana State University Museum of Zoology (LSUMZ); Hobart M. Smith, University of Illinois Museum of Natural History (UIMNH); Charles F. Walker, University of Michigan Museum of Zoology (UMMZ); and John W. Wright, Los Angeles County Museum (LACM). Specimens in the collection at the University of Kansas Museum of Natural History are identified as KU. The abbreviations EHT-HMS refer to the Edward H. Taylor-Hobart M. Smith collection and FAS to the Frederick A. Shannon collection. The type-specimens from these collections are now in the Field Museum of Natural History and the University of Illinois Museum of Natural History. I have profited from discussions concerning this problem with several persons, most notably William E. Duellman, Hobart M. Smith, Edward H. Taylor and Charles F. Walker. Nevertheless, the ideas and conclusions presented here should not be construed as necessarily reflecting their opinions. David M. Dennis executed all of the figures, and my wife, Marsha, typed the manuscript. _Materials and Methods._--In the course of this study, 1003 specimens of the genus were examined. The holotypes of 21 of the 23 nominal species are extant; I have examined 19 of these. Nine measurements were taken, and five ratios computed for each of 338 specimens. Females are available for all species but one; thus, measurements were taken on individuals of both sexes. ANALYSIS OF CHARACTERS _Size and proportions._--Frogs of this genus range in size from 16 to 40 mm. in snout-vent length. Five species are relatively small: _S. cystignathoides_, _modestus_, _nivocolimae_, _pallidus_ and _rubrimaculatus_; one, _S. longipes_, is relatively large, and the remaining eight species are intermediate in size (22-30 mm.). Males are generally smaller than females and have proportionately longer heads and usually larger tympani. No significant differences were found among proportions, except that _S. longipes_ has a larger tympanum/eye ratio than any other species. Frogs in the _Syrrhophus marnockii_ group tend to have shorter shanks and feet, thereby giving those species a more stocky appearance. However, the differences are not significant. A summary of the data on size and proportions for the frogs of the genus _Syrrhophus_ is given in Tables 4, 5, and 6. _Hands and Feet._--Taylor and Smith (1945), Smith and Taylor (1948), Firschein (1954) and Duellman (1958) discussed the value of the palmar tubercles in identifying frogs of this genus. The eastern complex in general has a well-developed outer palmar tubercle (Fig. 1) in distinction to the western complex in which the outer palmar tubercle is reduced or absent (Fig. 2). Dixon and Webb (1966) imply that the outer palmar tubercle is rarely absent but is usually smaller than the first supernumerary tubercle of the fourth finger. My study of the western species demonstrates that the outer palmar tubercle is indeed usually present and smaller than the first supernumerary tubercle. Differences in interpretation of the terms "unexpanded" and "narrow," as well as differences in techniques of preservation, have led to confusion of the reported digital shapes in various species. Constant specific differences are evident in the hands (Fig. 1). Except in the cases of excessive uptake of fluids, all species have a terminal transverse groove at the tip of each digit. Taylor (1940b) stated that _S. smithi_ lacked grooves, but examination of the holotype reveals faint grooves at the tops of the digits. _Syrrhophus guttilatus_, _leprus_, _pipilans_, and _verrucipes_ lack lateral fringes on the fingers. Lateral fringes are well developed in the _longipes_ and _modestus_ groups but poorly defined or absent in the other members of the genus. The digital pads of the frogs of the _longipes_ group are much broader than those of the other species and are narrowest in the frogs of the _leprus_ group. Supernumerary tubercles are present on the palmar surfaces of all species of the genus. TABLE 4--Size and Proportions in the Frogs of the _Syrrhophus leprus_ Group. A: _cystignathoides campi_ B: _c. cystignathoides_ C: _leprus_ D: _rubrimaculatus_ ========================================================================== Snout-vent Tibia Head Tympanum/ Eyelid/ length length/ width/ Eye Interorbital Species Sex N (SVL) SVL SVL -------------------------------------------------------------------------- A [M] 33 16.3-23.5 41.3-49.6 34.0-40.1 43.7-66.5 43.2-89.6 (45.8) (37.0) (56.2) (61.5) [F] 12 16.0-25.8 41.5-51.0 33.0-38.0 42.8-60.0 48.2-69.2 (45.8) (35.0) (51.2) (60.1) B [M] 15 16.8-22.1 45.1-50.4 33.2-40.7 44.3-68.7 44.6-65.4 (47.3) (37.8) (54.8) (60.0) [F] 6 19.6-24.2 46.4-50.0 34.1-38.1 43.3-56.5 53.2-65.4 (47.6) (36.2) (46.9) (59.2) C [M] 14 20.6-26.4 42.3-52.3 35.0-40.3 47.5-62.5 58.2-72.5 (46.8) (37.4) (56.5) (67.3) [F] 15 22.1-29.2 43.4-53.3 32.6-38.9 38.6-57.9 50.2-86.9 (47.1) (35.8) (47.1) (68.1) D [M] 12 18.2-23.5 40.4-46.2 31.8-35.5 35.5-46.5 65.1-78.5 (43.4) (33.8) (41.7) (71.7) ========================================================================== TABLE 5--Size and Proportions in the Frogs of the _Syrrhophus longipes_ and _S. marnockii_ Groups. A: _dennisi_ B: _longipes_ C: _guttilatus_ D: _marnockii_ E: _verrucipes_ ========================================================================== Snout-vent Tibia Head Tympanum/ Eyelid/ length length/ width/ Eye Interorbital Species Sex N (SVL) SVL SVL -------------------------------------------------------------------------- A [M] 16 22.8-28.4 43.9-49.7 35.3-41.2 53.9-64.2 55.3-74.0 (47.4) (38.8) (58.9) (65.1) [F] 10 25.9-32.0 46.3-50.8 35.6-40.3 50.6-58.7 58.1-70.9 (48.2) (37.7) (54.9) (63.6) B [M] 22 22.1-33.2 45.8-51.7 38.7-44.4 61.1-87.2 61.5-83.0 (48.4) (41.8) (72.0) (72.0) [F] 19 26.8-39.6 44.3-51.0 36.3-40.8 49.5-72.1 55.3-85.9 (47.2) (39.1) (59.5) (67.9) C [M] 19 20.6-29.0 41.2-48.1 36.9-44.9 55.1-75.7 53.3-79.5 (44.5) (40.6) (64.1) (66.0) [F] 5 25.7-31.0 41.4-46.8 35.9-42.3 47.6-61.7 62.3-79.8 (43.6) (38.5) (54.0) (72.9) D [M] 14 18.4-28.9 42.3-47.2 36.1-43.0 47.2-68.3 51.6-74.4 (44.1) (39.6) (61.2) (66.3) [F] 29 20.4-35.4 38.7-46.4 35.9-41.3 45.8-73.3 52.1-70.5 (42.7) (38.2) (60.3) (60.7) E [M] 29 17.5-29.2 42.7-49.5 36.2-42.4 56.1-82.2 56.8-82.8 (46.3) (39.1) (67.8) (70.4) [F] 6 26.5-31.7 42.4-47.7 36.0-38.1 45.8-57.8 61.0-77.9 (44.6) (37.0) (53.9) (69.0) ========================================================================== TABLE 6--Size and Proportions in the Frogs of the _Syrrhophus pipilans_ and _S. modestus_ Groups. A: _pipilans nebulosus_ B: _pipilans pipilans_ C: _modestus_ D: _pallidus_ E: _teretistes_ F: _nivocolimae_ G: _interorbitalis_ ========================================================================== Snout-vent Tibia Head Tympanum/ Eyelid/ length length/ width/ Eye Interorbital Species Sex N (SVL) SVL SVL -------------------------------------------------------------------------- A [M] 17 22.9-28.5 38.1-42.0 34.4-37.2 36.6-47.8 56.1-82.4 (40.0) (35.4) (43.6) (68.2) [F] 3 21.1-22.7 42.1-44.5 33.2-35.8 36.6-47.6 64.3-65.4 B [M] 18 22.6-27.8 37.9-44.0 32.2-36.5 38.0-54.0 56.1-79.5 (41.4) (33.0) (46.2) (67.3) [F] 1 29.4 38.4 32.5 44.6 55.0 C [M] 8 15.8-20.1 38.5-42.6 32.1-38.1 26.8-39.3 57.0-86.9 (40.6) (34.2) (31.5) (69.1) [F] 1 18.5 44.2 36.0 24.0 52.1 D [M] 6 17.9-19.3 41.0-44.9 32.6-36.2 27.0-35.6 59.4-67.7 (43.4) (35.2) (30.9) (65.2) E [M] 18 19.2-23.2 41.5-45.3 32.5-36.4 28.6-43.8 51.2-75.0 (43.7) (34.0) (33.7) (62.2) [F] 1 24.8 41.8 30.8 37.9 60.5 F [M] 15 18.9-21.1 42.2-48.6 30.9-37.1 30.0-39.3 42.6-69.1 (45.0) (33.7) (34.7) (55.0) [F] 1 24.1 40.9 33.5 27.6 56.5 G [M] 1 25.6 43.0 ---- 39.4 57.6 [F] 9 20.2-26.7 39.9-47.1 32.6-39.3 29.1-41.2 58.2-76.9 (43.2) (35.8) (36.4) (69.2) ========================================================================== [Illustration: FIG. 1: Palmar views of hands of six species of the eastern complex of _Syrrhophus_. (A) _verrucipes_ (UIMNH 15995), (B) _rubrimaculatus_ (KU 58911), (C) _dennisi_ sp. nov. (holotype, UMMZ 101121), (D) _guttilatus_ (UIMNH 55520), (E) _marnockii_ (TCWC 4782), and (F) _longipes_ (TCWC 12179). All x6.5.] [Illustration: FIG. 2: Palmar views of hands of two species of the western complex of _Syrrhophus_. _pipilans_ (left, KU 58908, x6) and _teretistes_ (center, KU 75269, and right, KU 75263, respectively, x9).] In _S. cystignathoides_ and _leprus_, the first finger is longer than the second, and the first two fingers are equal in length in _guttilatus_ and _marnockii_. In the other species the first finger is shorter than the second. Supernumerary tubercles are well developed on the plantar surfaces in all species, except _S. guttilatus_, in which they are poorly defined (Fig. 3). The relative sizes of the metatarsal tubercles has been used in the classification of the species and species groups of _Syrrhophus_. The metatarsal tubercles are similar in all species of the eastern complex (including _rubrimaculatus_); the outer tubercle is always about one-half the size of the ovoid inner metatarsal tubercle. In the _leprus_ group the outer tubercle is conical and compressed. The metatarsal tubercles of _pipilans_ are about the same size, or the outer is slightly smaller than the inner. In the _modestus_ group the outer metatarsal tubercle is about one-third the size of the inner. All species, except _guttilatus_, have well-defined to poorly defined lateral fringes on the toes. All species have expanded toe pads. The fifth toe is usually shorter than the third, but the second is equal in length to the fifth in some specimens of _S. cystignathoides_ and _S. marnockii_. _Syrrhophus nivocolimae_ is the only species with tubercles along the outer edge of the tarsus; this is merely a reflection of the highly tuberculate nature of the skin in this species. _Skin texture._--The skin of the dorsum is smooth or very weakly pustular in all species of the genus except _nivocolimae_ and _verrucipes_. The dorsal surfaces of _nivocolimae_ are warty; in _verrucipes_ the skin is pustular. The skin of the venter is areolate in _cystignathoides cystignathoides_, _dennisi_ and _verrucipes_ but is smooth in all other species of the genus. [Illustration: FIG. 3: Plantar views of feet of four species of the eastern complex of _Syrrhophus_. (A) _guttilatus_ (UIMNH 55519, x6), (B) _leprus_ (UIMNH 42726, x6), (C) _verrucipes_ (UIMNH 15995, x6), and (D) _longipes_ (TCWC 12179, x4.6).] _Color pattern._--As is evident in the diagnoses, the color patterns of given populations have been regarded as useful in separating the species and subspecies. Duellman (1958) suggested that the coloration, with the exception of _modestus_, was a dark ground color with pale markings. It is a moot point whether the frogs have light spots on a dark background or have a light background with an extensive reticulate dark pattern. The venters are gray or white, and the vocal sac is nearly black in some species. Interorbital dark bars or triangles are absent in only two species of the eastern complex, _cystignathoides campi_ and _marnockii_; the latter lacks a supratympanic stripe, which is present in the other members of the eastern complex. _Syrrhophus interorbitalis_ and _nivocolimae_ have light interorbital bars; these bars occur in only one other population of the genus (_S. c. cystignathoides_). Bars on the thighs are ill defined or absent in the members of the _marnockii_ and part of the _modestus_ groups. The color in life is noted in the species accounts. _Voice._--The voices of all _Syrrhophus_ can be described as a single short chirp or peep; without audiospectrographic analyses the significance of the differences between a chirp, peep, or short whistle cannot be appreciated. Martin (1958) and Wright and Wright (1949) reported multi-noted calls, and one collector of _S. verrucipes_ noted the frog "trilled." Fouquette (1960) presented analyses of two species (_marnockii_ and _pipilans nebulosus_). The voices were very similar; both frogs were reported to "trill" and "chirp." SYSTEMATIC ACCOUNT The genus _Syrrhophus_ has been defined (Lynch, 1968) and limited to the group of species occurring in Guatemala, Mexico and the United States. The closest relatives of _Syrrhophus_ are the frogs of the genus _Tomodactylus_ (Dixon, 1957; Firschein, 1954). Lynch (1968) implied there were no osteological bases for the separation of _Eleutherodactylus_, _Syrrhophus_, and _Tomodactylus_. At that time, I believed such to be the case and derived _Syrrhophus_ and _Tomodactylus_ from the _rhodopis_ complex of _Eleutherodactylus_, with which they share terrestrial habits and relatively short limbs. In the _rhodopis_ complex there is a tendency for the loss of the outer palmar tubercle, a not uncommon condition in _Syrrhophus_ and _Tomodactylus_. However, the skulls of _Syrrhophus_ and _Tomodactylus_ show departures from the pattern observed in the Middle American _Eleutherodactylus_, as well as many of those species in western South America. Baldauf and Tanzer (1965) reported that the frontoparietals and prootics were fused in _Syrrhophus marnockii_ and that the prootics and exoccipitals appeared to be one bone (otoccipital). The otoccipital is not uncommon in eleutherodactyline frogs, but the fusion of the frontoparietals with the prootics (regardless of the fusion of the latter with the exoccipital) is uncommon in the family. I have found the frontoparietal-prootic fusion only in _Syrrhophus_ (all species), _Tomodactylus_ (all species), and _Eleutherodactylus_ (West Indies species). None of the Middle American _Eleutherodactylus_ has the two bones fused. Examination of the character is difficult in dried skeletal preparations. Cleared and stained or macerated preparations are satisfactory for checking this character. Thus, in addition to the presence of numerous plantar supernumerary tubercles in the frogs of the genera _Syrrhophus_ and _Tomodactylus_, these two genera can be separated from other Middle American eleutherodactylines by the fusion of the frontoparietals and prootics. This character not only further strengthens the argument that the two genera are closely related but poses a problem of zoogeographic analysis of the distribution of the character, which will be discussed fully elsewhere. Key to the Species of the Frog Genus _Syrrhophus_ 1. Three large, well-developed palmar tubercles 2 Two large palmar tubercles; outer (third) palmar tubercle reduced in size or absent 9 2. Digital pads more than twice (usually three or more) times width of digit 3 Digital pads less than twice width of digit 4 3. Males having vocal slits; dorsum vermiculate; diameter of tympanum in males about one-half diameter of eye _S. dennisi_ Males lacking vocal slits; dorsum flecked, spotted, or blotched; diameter of tympanum in male about three-fourths that of eye _S. longipes_ 4. First finger longer than second 5 First finger shorter than or equal to second 7 5. Venter smooth; dorsum spotted or vermiculate _S. leprus_ Venter areolate, or if smooth, dorsum flecked and interorbital bar lacking 6 6. Venter areolate; interorbital bar present; ground color yellowish _S. cystignathoides cystignathoides_ Venter smooth; interorbital bar absent; ground color brown _S. cystignathoides campi_ 7. First finger shorter than second; digital tips only slightly dilated; green in life with darker green spots _S. verrucipes_ First finger equal to second; digital tips slightly to moderately expanded 8 8. Dorsum vermiculate; interorbital bar present; ground color cream to brown in life _S. guttilatus_ Dorsum punctate or flecked; interorbital bar absent; ground color green in life _S. marnockii_ 9. Dorsum dark with pale (red in life) spots; digital pads not expanded _S. rubrimaculatus_ Dorsum pale with dark markings and digital pads slightly to widely expanded 10 10. Digital tips not widely expanded; tympanum well-defined; outer metatarsal tubercle more than one-half size of inner 11 Digital tips widely expanded, truncate in outline; tympanum poorly defined; outer metatarsal tubercle less than one-half size of inner 12 11. Dorsum dark brown with large light spots or blotches; tympanum/eye ratio usually greater than 43 percent _S. pipilans pipilans_ Dorsum dark brown with small light spots; tympanum/eye ratio less than 48 percent _S. pipilans nebulosus_ 12. Light interorbital bar present 13 Light interorbital bar absent 14 13. Adults small, less than 22 mm. snout-vent length with a broad mid-dorsal stripe; dark bands on shank narrower than light interspaces _S. nivocolimae_ Adults larger, more than 22 mm. snout-vent length; dorsum vermiculate; dark bands on shank broader than light interspaces _S. interorbitalis_ 14. Dorsum spotted with discrete black spots; pattern definite _S. modestus_ Dorsum reticulate or vermiculate, pattern poorly defined 15 15. Adults small, less than 21 mm. snout-vent length; upper arm not banded _S. pallidus_ Adults larger, usually greater than 21 mm. snout-vent length; upper arm banded _S. teretistes_ SPECIES ACCOUNTS The following accounts do not include complete descriptions of each taxon, because a more than adequate number of descriptions is available in the recent (1940-1966) literature. An abbreviated synonymy, in which are listed all combinations and emendations of names and significant contributions to our knowledge of the taxon, is given for each. For each species and subspecies the following are given: descriptive diagnosis, statement of range, remarks on taxonomy, list of specimens examined, illustration of color pattern, and distribution map. =Syrrhophus cystignathoides= (Cope) _Phyllobates cystignathoides_ Cope, 1877:89-90 [Syntypes.--Originally USNM 32402-32409, (32405 now in MCZ) from Potrero, near Cordoba, Veracruz, Mexico, Francis Sumichrast collector.] _Diagnosis._--Adults small, males 16.0 to 23.5 mm. in snout-vent length, females 16.0-25.8 mm. in snout-vent length; vocal slits present in males; finger tips slightly expanded; first finger longer than second; outer metatarsal tubercle one-half size of inner, conical, compressed; skin of dorsum weakly pustular, that of venter smooth to areolate; tympanum 44 to 69 per cent diameter of eye (mean 55.5 per cent); ground color yellow to brown in life with brown to black fleckings on dorsum and flanks; limbs banded; interorbital bar present or not. _Remarks._--Two geographic races (subspecies) are herein recognized; previously these were held by various authors to be species (_campi_ and _cystignathoides_). Intergradation occurs in southern Tamaulipas and eastern San Luis Potosi, Mexico. The two subspecies can be distinguished on the basis of color pattern and the condition of the skin of the venter. _Distribution._--Low to moderate elevations from the Rio Grande embayment to central Veracruz, Mexico (Fig. 5). =Syrrhophus cystignathoides campi= Stejneger, New combination _Syrrhophus campi_ Stejneger, 1915:131-32. [Holotype.--USNM 52290, from Brownsville, Cameron Co., Texas; R. D. Camp collector, March 31, 1915]. Smith and Taylor, 1948:52. Martin, 1958:50. _Diagnosis._--Venter smooth; usually no interorbital light and dark bars present; ground color brown in life (Fig. 4a). _Remarks._--Martin (1958) was the first author to point out that _S. campi_ was probably a subspecies of the more southern _S. cystignathoides_. Various references in the literature might lead one to believe that the two were sympatric over much of northeastern Mexico; this error was created by the use of a single character (condition of the skin of the venter) to characterize the two populations. Specimens from southern Texas have a smooth venter, lack interorbital bars and have, in general, a brown ground color, whereas specimens from central Veracruz have an areolate venter, interorbital light and dark bars and a yellow ground color. In southern Tamaulipas and eastern San Luis Potosi, these characters vary discordantly, thereby strongly suggesting that the two populations intergrade. Both populations agree in other morphological characters; therefore, they are here treated as geographic variants. _Etymology._--Named for the collector of the type specimens, Mr. R. D. Camp of Brownsville, Texas. _Distribution._--Lower Rio Grande embayment in Texas to central Nuevo Leon and Tamaulipas, Mexico. Intergrades are known from southern Tamaulipas and adjacent San Luis Potosi, Mexico (Fig. 5). _Specimens examined._--(113) TEXAS, Cameron Co.: MCZ 10277-85, 10286 (10); Brownsville, AMNH 3215, 3218-20, 3221 (3), 5376, 62117, FMNH 105336, KU 8135-39, MCZ 3738-42, 3743 (10), TCWC 5908, 7139, TNHC 92-94, 20909, UMMZ 51760, 54031 (5), USNM 52290 (holotype); 22 mi. SE Brownsville, TNMC 14223; 8 mi. SW Brownsville, UMMZ 101127 (3); Harlingen, AMNH 62118, UMMZ 105200-205, 105206 (5), 105207 (4). _Hidalgo Co._: Bentsen-Rio Grande State Park, UMMZ 114378; 6 mi. S McAllen, TNHC 7136-39; Santa Ana Refuge, TCWC 13495-96; Weslaco, TCWC 17658-60. MEXICO, _Nuevo Leon_: Salto Cola de Caballo, AMNH 57953-54, FMNH 30644-45, 37169-70; Monterrey, UIMNH 13324; 40 km. SE Monterrey, UIMNH 3686. _Tamaulipas_: 80 km. Matamoros, FMNH 27150 (13). Intergrades [_S. c. cystignathoides_ x _S. c. campi_ (88)] MEXICO, _San Luis Potosi_: 5 km. E Ciudad del Maiz, UMMZ 106435; 16 km. W Naranjo, FMNH 104584; Salto de Agua, 34 km. WSW Antigua Morelos, TCWC 6980. _Tamaulipas_: 5 km. W Acuna, 1060 m., UMMZ 101172, 101173 (16), 101174-76, 101177 (6); 14.5 km. NNW Chamal, 430 m., UMMZ 111337 (2); 20 km. NNW Chamal, 700 m., UMMZ 111338 (11); 8 km. N Gomez Farias, 450 m., UMMZ 101165; 8 km. NE Gomez Farias, Pano Ayuctle, UMMZ 102264, 102924 (6); 8 km. NW Gomez Farias, 1060 m., LSUMZ 11084, UMMZ 101199, 102928 (5), 102929-32, 110124 (3); Rio Guayala, near Magiscatzin, MCZ 24138-42, 85071-81, UMMZ 88242 (2); Magiscatzin, TCWC 6981; Las Yucas, north of Aldama, MCZ 29665-68; 16 km. NE Zamorina, UMMZ 101124. [Illustration: FIG. 4: _Syrrhophus cystignathoides campi_ (left, TCWC 13490) and _S. c. cystignathoides_ (right, KU 105500). Dorsal views x2, sides of heads x3.] =Syrrhophus cystignathoides cystignathoides= (Cope), New combination _Phyllobates cystignathoides_ Cope, 1877:89-90 [Syntypes.--USNM 32402-32409, from Potrero, near Cordoba, Veracruz, Mexico, collected by Francis Sumichrast]. Boulenger, 1882:196. _Syrrhophus cystignathoides_: Cope, 1879:268. Kellogg, 1932: 126-27. Taylor and Smith, 1945: 582-83. Smith and Taylor, 1948:50. Martin, 1958:49. _Syrrhaphus cystignathoides_: Guenther, 1900:218. _Syrraphus cystignathoides_: Diaz de Leon, 1904:10. _Syrrhopus cystignathoides_: Barbour and Loveridge, 1946:170. [Illustration: FIG. 5: Distribution of _Syrrhophus cystignathoides campi_ (solid symbols) and the nominate subspecies (open symbols).] _Diagnosis._--Venter areolate; interorbital light and dark bars present; ground color yellow to brownish-yellow in life (Fig. 4b). _Remarks._--Firschein (1954) briefly considered the status of Peters' (1871) _Phyllobates verruculatus_ and noted that if it was a _Syrrhophus_ it would probably be referrable to _S. cystignathoides_. Peters' (1871) original description corresponds well with _S. cystignathoides_, and the type-locality ("Huanusco" = Huatusco) is within the range of that species. Firschein (1954) expressed doubt that _verruculatus_ was a _Syrrhophus_, because Peters placed it in another genus. However, Peters described _verruculatus_ a decade before Cope diagnosed the genus Syrrhophus. Most frogs now called _Syrrhophus_, plus a number of lower Central American frogs now placed in a variety of genera were placed in _Phyllobates_ by Boulenger, Cope, and Peters. The types of _Phyllobates verruculatus_ were destroyed during World War II (Guenther Peters, _in litt._); the specimens subsequently assigned to the taxon by Kellogg (1932) are _Syrrhophus cystignathoides_. Because the type specimens are lost and because the name antedates the more established name, _cystignathoides_, I favor retaining _Phyllobates verruculatus_ Peters as a _nomen dubium_. Smith and Taylor (1948) reported _S. verruculatus_ from Tianguistengo, Hidalgo, Mexico. These specimens are examples of _verrucipes_. Smith (1947) reported a specimen of _verruculatus_ from San Lorenzo, Veracruz. Firschein (1954) referred it to _cystignathoides_, and Duellman (1960) concluded that both authors were in error and that the specimen (USNM 123530) was a _leprus_. _Etymology._--The trivial name is the diminutive of _Cystignathus_, a once-used generic name for several leptodactylid frogs. _Distribution._--Low and moderate elevations in the foothills along the Sierra Madre Oriental from eastern San Luis Potosi to Central Veracruz, Mexico (Fig. 5). _Specimens examined._--(130), MEXICO, _Puebla_: Necaxa, UMMZ 69519-20. _San Luis Potosi_: 5 km. W Aguismon, LSUMZ 4962-63; along Rio Axtla, road to Xilitla, UMMZ 105500; Tamazunchale, UIMNH 3199; 6.5 km. N Tamazunchale, UMMZ 104039; 8 km. N Tamazunchale, UMMZ 119490. _Veracruz_: Coatepec, 1210 m., FMNH 704966-67; 11 km. SE Coatepec, 850 m., FMNH 70468-70; below Cordoba, FMNH 104588, UIMNH 13321; Cuautlapam, 1000 m., FMNH 106477-80, KU 100364, UIMNH 58200-03, UMMZ 105392; Fortin de las Flores, UIMNH 13322, 13339; 1.6 km. N Fortin de las Flores, UIMNH 42799-808, UMMZ 105389; 3.2 km. N Fortin de las Flores, UIMNH 26633-35; 4.8 km. N Fortin de las Flores, UIMNH 71967-68; 3.2 km. W Fortin de las Flores (Barranca Metlac), 910 m., UIMNH 49294-95, UMMZ 115444-46, 118221, 119893 (2); Huatusco, KU 100363; Jalapa, 1400 m., FMNH 70440, 70443-51, 70454-65; 16 km. NE Jalapa, 1300 m., FMNH 70452-53; 8 km. E Jalapa, UIMNH 13338; 9.5 km. S Jalapa, UMMZ 122083 (2); Mirador, KU 23967; Paraja Nuevo, El Suchil, UMMZ 85490 (7), 85491 (2), 90315; La Passa, UIMNH 49293, 49297; 1 km. E Plan del Rio, 240 m., UMMZ 102067 (2); Potrero Viejo, FMNH 104583, 104586, 105326-27, KU 26789, 100357-62, UIMNH 13323, 13340-43; USNM 32402 (lectotype), 32403-04, 32406-09; 9.6 km. S Santa Rosa, TCWC 12785; 24 km. NE Tezuitlan (Puebla), UMMZ 105388; Teocelo, FMNH 70437-38, KU 26080, 26790; 3.2 km. N Teocelo, FMNH 70439, 70441-42; 9.6 km. NW Tihuatlan, UIMNH 3684-85; 15 km. ENE Tlacotepec, KU 23966; 26 km. NW Tuxpan, UMMZ 126419. =Syrrhophus leprus= Cope _Syrrhophus leprus_ Cope, 1879:268-69 [Holotype.--USNM 10040, from Santa Efigena, Oaxaca, Mexico, Francis Sumichrast collector]. Kellogg, 1932:124-5, 128. Taylor and Smith, 1945:582. Smith and Taylor, 1948:50-51. Duellman, 1958:8, pl. 1, Fig. 2; 1960:56-57. Gorham, 1966:165. _Syrrhaphus leprus_: Guenther, 1900:217. _Syrrhophus leprus leprus_: Neill, 1965:85-86. _Syrrhophus leprus cholorum_ Neill, 1965:85-86 [Holotype.--Wilfred T. Neill collection 1525, from 3.9 mi. N San Antonio, Toledo District, British Honduras, collected October 28, 1959, by R. A. Allen, T. C. Allen, and W. T. Neill]. _Diagnosis._--Medium-sized frogs, males 20.5-26.5 mm. in snout-vent, females 22.0-29.3 mm. in snout-vent length; vocal slits present in males; tips of fingers dilated slightly; first finger longer than second; inner metatarsal tubercle twice size of small, conical outer metatarsal tubercle; skin of dorsum pustular, that of venter smooth; snout subacuminate; diameter of tympanum 47.5-62.5 per cent of eye in males, 38.6-57.9 per cent in females; dorsum yellowish-green with chocolate brown blotches or spots forming reticulations in most specimens; venter white to gray; flanks brown, spotted with white or not; limbs banded; interorbital bar obscured by dorsal pattern. [Illustration: FIG. 6: Dorsal views of _Syrrhophus leprus_ showing variation in dorsal pattern (left, UMMZ 121244, x2; right, KU 26106, x1.7). Side of head (UIMNH 42726, x7).] [Illustration: FIG. 7: Distribution of three species of eastern complex _Syrrhophus_: _leprus_ (circles), _rubrimaculatus_ (triangles), and _verrucipes_ (squares).] _Remarks._--My distribution map (Fig. 7) differs somewhat from that of Duellman (1958), who was unaware of specimens reported by Taylor and Smith (1945) from central Veracruz, Mexico. Duellman (1958, 1960) regarded _S. leprus_ as having a gray venter. Neill (1965) characterized his new subspecies on the basis of white venter and spots on the dorsum. Some specimens from throughout the range have only small round spots, instead of vermiculations (Fig. 6). The gray ventral coloration is largely restricted to the population in Los Tuxtlas, Veracruz, but only about 80 per cent of the specimens from the Los Tuxtlas have gray venters, whereas specimens from Guatemala, Oaxaca, Tabasco, and central Veracruz, Mexico, have white venters (rarely gray). Since the specimens from British Honduras are not distinct from specimens throughout most of the range, there is no reason to recognize them as a subspecies. _Etymology._--Greek, _lepra_, leprosy, in reference to the mottled color pattern. _Distribution._--Discontinuous; central Veracruz to British Honduras to low elevations in the foothills of the Sierra Madre Oriental, Los Tuxtlas, Sierra Madre de Chiapas (Isthmus of Tehuantepec (Fig. 7)). _Specimens examined._--(84). GUATEMALA, _Alta Verapaz_: Chinaja, KU 55961-62. _El Peten_: 15 km. NW Chinaja, KU 55963; Piedras Negras, USNM 114085-92; Tikal, UMMZ 117035; Uaxactun, AMNH 55121-22. MEXICO, _Oaxaca_: Cerro San Pedro del Isthmo, UIMNH 35510; Finca La Gloria, USNM 114093; 30.5 km. N Matias Romero, UIMNH 39459, 71969; Santa Efigenia, USNM 10040 (holotype). _Tabasco_: Teapa, UMMZ 113799-800; 13.5 km. W Teapa, UMMZ 120253. _Veracruz_: 27.5 km. N Acayucan, UIMNH 42726; Atoyac, UIMNH 13331, 49296; 3.2 km. N Catemaco, UIMNH 71976-77; Coyame, UIMNH 38995, 38998, 40342; Dos Amates, TCWC 21211; Fortin de Las Flores, FMNH 113751, 113753; Paraja Nuevo, El Suchil, UMMZ 90315; Potrero Viejo, FMNH 113743-50, 126114-18, KU 26104-06, UIMNH 13332-37, UMMZ 88837; San Andres Tuxtla, UIMNH 27123-31, 28611, 71975, UMMZ 115450 (5); San Lorenzo, USNM 123530; 4.5 km. NW Santiago Tuxtla, JDL 992 (skeleton), UIMNH 27122; 32 km. S Sayula, EAL 1696; Tepalapan, 1.6 km. S Catemaco, UMMZ 118222 (2); Volcan San Martin, south slope, UMMZ 118223; Volcan San Martin, Rancho El Tular, UIMNH 35399-400, 40340-41. =Syrrhophus rubrimaculatus= Taylor and Smith _Syrrhophus rubrimaculatus_ Taylor and Smith, 1945:583-85 [Holotype.--USNM 114070, from La Esperanza, near Escuintla, Chiapas, Mexico, collected May 13, 1940, by H. M. and R. Smith]. Duellman, 1958:1-4, 7, 12, 14. Gorham, 1966:167. _Syrrhophus rubrimaculata_: Smith and Taylor, 1948:48-49. [Illustration: FIG. 8: _Syrrhophus rubrimaculatus_ (upper right, KU 58911, x1.6; lower right, KU 58910, x4) and _S. verrucipes_ (upper left, UIMNH 15995, x1.6; lower left, UIMNH 15989, x3.7).] _Diagnosis._--Small frogs, males 18.2-23.5 mm. snout-vent, females 19.0-22.5 mm. snout-vent length (small sample); vocal slits in males; digital tips scarcely expanded (Fig. 1); first finger shorter than second; outer palmar tubercle reduced in size; inner metatarsal tubercle elongate, twice the size of small, conical outer metatarsal tubercle; diameter of tympanum 35.5-46.5 per cent that of eye in both sexes; dorsum brown with small pale spots (red in life); venter gray. _Remarks._--Previous authors who treated _Syrrhophus_ placed this species in the western complex, because it occurs on the Pacific versant and has a reduced outer palmar tubercle. Duellman (1958) placed _rubrimaculatus_ apart from the other western species, because of its relatively unexpanded digital tips and coloration. The digital tips are like those in _leprus_, which _rubrimaculatus_ resembles. Except for the reduction of the outer palmar tubercle, _rubrimaculatus_ could be a member of the _leprus_ group. _Syrrhophus rubrimaculatus_ is probably best treated as a Pacific derivative of the _leprus_ group, even though the palmar tubercles do not agree. The removal of _rubrimaculatus_ from the western complex results in a more homogeneous remainder and does not greatly increase the heterogeneity of the eastern complex. _Etymology._--Latin, meaning spotted with red; in reference to the colors in life. _Distribution._--Low to moderate elevations on the Pacific versant of southeastern Chiapas, Mexico (Fig. 7); probably extending into adjacent Guatemala. _Specimens examined._--(48) MEXICO, _Chiapas_: Escuintla, UMMZ 88283; 6 km. NE Escuintla, UMMZ 87876-80; La Esperanza, UIMNH 13285, UMMZ 88496-97, USNM 114070 (holotype), 114054-69, 114072; Monte Cristo, UMMZ 88353; 1.3 km. N Puerto Madero, KU 58910-11; Finca San Jeronimo, 600-650 m., UIMNH 55299-312, 55313-16 (cleared and stained). =Syrrhophus guttilatus= (Cope) _Malachylodes guttilatus_ Cope, 1879:264 [Holotype.--USNM 9888, from Guanajuato, Guanajuato, Mexico; collected in 1877 by Alfredo Duges]. _Syrrhopus guttulatus_: Boulenger, 1888:204-06. _Syrrhaphus guttulatus_: Guenther, 1900:317. _Syrraphus guttulatus_: Diaz de Leon, 1904:11. _Syrrhophus guttilatus_: Nieden, 1923:399-400. Kellogg, 1932:125, 127-28. Smith and Taylor, 1948:49, 51. Firschein, 1954:52-54. Gorham, 1966:164. _Syrrhophus smithi_ Taylor, 1940b:43-45, pl. 1 [Holotype.--USNM 108594, from 15 mi. SW Galeana, Nuevo Leon, Mexico, 1575 m.; collected on October 13, 1939, by Hobart M. Smith]. Smith and Taylor, 1948:49, 51. Firschein, 1954:54-55. Martin, 1958:50. Gorham, 1966:167. _Syrrhophus gaigeae_ Schmidt and Smith, 1944:80 [Holotype.--FMNH 27361, from the Basin, Chisos Mountains, Brewster Co., Texas; collected on July 24, 1937, by Walter L. Necker]. _Syrrhophus petrophilus_ Firschein, 1954:50-52 [Holotype.--UIMNH 7807, from 5 km. SW San Luis Potosi, San Luis Potosi, Mexico; collected on July 18, 1949, by David Langebartel]. Gorham, 1966:166. _Syrrhophus marnocki_: Milstead, Mecham, and McClintock, 1950:548 (in part). _Diagnosis._--Medium-sized frogs, males 20.6-29.0 mm. snout-vent, females 25.7-31.0 mm. snout-vent length; vocal slits in males; digital tips slightly expanded (Fig. 1); first and second fingers equal; skin of dorsum smooth to moderately pustular, that of venter smooth; snout blunt; diameter of tympanum 55.1-75.7 per cent that of eye in males, 47.6-61.7 in females; dorsum and flanks cream to gray with light brown to black flecking and vermiculations; thighs usually not banded; interorbital bar present (Fig. 8). [Illustration: FIG. 9: _Syrrhophus guttilatus_ (upper left, UIMNH 55519, x1.4; lower left, UIMNH 55519, x2.3) and _S. marnockii_ (upper right, TCWC 9317, x1.4; lower right, TCWC 13510, x2.1).] _Remarks._--Cope (1879) distinguished _Malachylodes_ from _Syrrhophus_ on the basis of the presence of a frontoparietal fontanelle in the holotype of _guttilatus_. The holotype is a juvenile female and as is the case in the juveniles of nearly all leptodactylids, a frontoparietal fontanelle is present. Firschein (1954) used the presence of the fontanelle to distinguish _guttilatus_ from his _petrophilus_. As is clearly evident from the length of the synonymy, I consider a number of currently used names to be synonymous with _guttilatus_. I have seen the holotypes of all four names and am unable to recognize more than a single species. The holotype of _petrophilus_ is a male, whereas that of _smithi_ is a female. The supposed differences are a reflection of sexual dimorphism in the size of the eye (Table 5). The two holotypes, as well as those of _gaigeae_ and _Malachylodes guttilatus_ agree in color pattern. Schmidt and Smith (1944) named _Syrrhophus gaigeae_ from the Chisos Mountains of the Big Bend region of Texas and compared it only with _S. marnockii_. Milstead, Mecham and McClintock (1950) synonymized _gaigeae_ and _marnockii_ because they were unable to verify the characters Wright and Wright (1949) used to separate them. Specimens from the Big Bend region differ from those of the Edward and Stockton Plateaus in having a vermiculate pattern, an interorbital bar, and a supratympanic stripe. In these respects they agree with specimens from northern Mexico. Based on limited observations, the Mexican population is yellowish to brownish in life whereas the central Texas population is green in life. Lacking evidence of genetic exchange, the two are held to be specifically distinct. Nearly every specimen examined was infested with chiggers of the genus _Hannemania_. The greatest concentrations are on the venter, in the groin, and on the thighs. Many specimens have chiggers on the digits and tarsi. The same, or a related, chigger was found on many specimens of _Syrrhophus marnockii_ and a few _S. verrucipes_, but on no other species of the genus. Mr. Willy Wrenn told me that he has seen heavy infestations of _Hannemania_ on _Syrrhophus pallidus_. Infestation by _Hannemania_ probably reflects similar ecologies rather than close relationships. [Illustration: FIG. 10: Distribution of _Syrrhophus guttilatus_.] _Etymology._--Latin, _guttula_, meaning spotting or flecking, in reference to the color pattern. _Distribution._--Moderate to intermediate elevations (600 to 2000 m.) along the Sierra Madre Oriental from the Big Bend Region of Texas to Guanajuato, Mexico (Fig. 10). _Specimens examined._--(32) TEXAS, _Brewster Co._: Juniper Canyon, Chisos Mts., FMNH 27361 (holotype of _S. gaigeae_), 27360, 27362-63, MCZ 15346, 27801, UMMZ 66080, 66082, 66085-91, USNM 76876; Upper Green Gulch, TCWC 15943. MEXICO: _Coahuila_: 8 km. S Saltillo, UIMNH 55518-21. _Guanajuato_: Guanajuato, USNM 9888 (holotype of _Malachulodes guttilatus_); 8 km. E Guanajuato, AMNH 73425; Cerro Cubilete, AMNH 73424. _Nuevo Leon_: 3 km. S Galeana, JDL 1215 (skeleton), UIMNH 58204; 24 km. SW Galeana. 1575 m., USNM 108594 (holotype of _Syrrhophus smithi_). _San Luis Potosi_: 5 km. SW San Luis Potosi, UIMNH 7807 (holotype of _S. petrophilus_). _Tamaulipas_: 1.6 km. NW La Joya de Salas, 1530 m., UMMZ 110736 (4). =Syrrhophus marnockii= Cope _Syrrhophus marnockii_ Cope, 1878:253 [Syntypes.--ANSP 10765-68, from "near San Antonio," Bexar Co., Texas; collected by G. W. Marnock]. _Syrrhophus marnocki_: Yarrow, 1882:24, 193. Milstead, Mecham, and McClintock, 1950:550. _Diagnosis._--Medium-sized frogs, males 18.4-28.9 mm. snout-vent, females 20.4-35.4 mm. snout-vent length; vocal slits in males; digital tips widened (Fig. 1); first and second fingers equal; skin of dorsum smooth to weakly pustular, that of venter smooth; snout blunt, rounded; diameter of tympanum 47.2-68.3 per cent that of eye in males, 45.8-73.3 in females; dorsum tan to light brown in preservative with rusty-brown flecks, venter white; ground color green in life; thighs banded; interorbital bar absent. _Remarks._--Specimens from the southern edge of the Edwards Plateau and the eastern edge of the Stockton Plateau have larger flecks on the back that tend to form a vermiculate pattern like that of _S. guttilatus_. The vermiculation is never well developed (see plate 38 in Conant, 1958). Most of the specimens from the Edwards Plateau have a punctate pattern (Fig. 9). Fossils are known from the Sangamon interglacial deposits in Foard and Knox Counties, Texas (Lynch, 1964; Tihen, 1960). _Etymology._--A patronym for the collector of the type specimens. _Distribution._--The Edwards Plateau and the extreme eastern edge of the Stockton Plateau in Texas (Fig. 11). The fossil records lie some 200 miles to the north. Two specimens (FMNH 103216-17) from Brownsville, Cameron Co., Texas, were formerly in the EHT-HMS collection (nos. 31348-49). Data given in Taylor's field catalogue (housed in the Division of Reptiles, Field Museum) are "Brownsville, A. J. Kirn collector, April 15, 1934." Until verification by recently collected material is available, this record must be disregarded. _Specimens examined._--(103) TEXAS, _Bandera Co._: 10 mi. SW Medina, TCWC 13508-10; 8 mi. W Medina, KU 60243; 13 mi. W Medina, KU 60242, TCWC 13506-07. _Bexar Co._: UIMNH 34694; Classen ranch, near San Antonio. UMMZ 98891; Helotes, EAL 1560, MCZ 11837 (2), UMMZ 64045, USNM 13635; 2 mi. N Helotes, TCWC 9234-35; 3.5 mi. N Helotes, LSUMZ 10363; 8 mi. N Helotes, TCWC 1549, 4364; San Antonio, FMNH 15553-56, TCWC 13497-99. _Blanco Co._: 8 mi. NE Blanco, TCWC 4782. _Comal Co._: New Braunfels, TCWC 13500-05; 5 mi. NE New Braunfels, UMMZ 71016 (10). _Hays Co._: San Marcos, AMNH 22661-64, 32700, FMNH 15245-46, 26250, 26253-57, 37617, 37665, MCZ 15649-50, 23268-69; 6 mi. SW San Marcos, TCWC 5070-71, 7140, 9232-33, 9236, 9316-17, 9320. _Kendall Co._: 11 mi. E Boerne, AMNH 54660-61, 54662 (2); 10 mi. W Boerne, KU 18441; Kendalia, UIMNH 21434. _Kerr Co._: Kerr W. M. Area, TCWC 15859; 40 mi. NW Kerrville, TCWC 6555. _Medina Co._: UIMNH 13287-88; 12 mi. N Castroville, UIMNH 21423; 14 mi. N Castroville, UIMNH 21424-25; 16 mi. N Castroville, UIMNH 21421-22; 17 mi. N Castroville, UIMNH 21428-29; 18 mi. N Castroville, UIMNH 21426-27, 21430-33; 6.5 mi. NW Rio Medina, KU 18440. _Real Co._: Rio Frio, FMNH 55156-57. _Travis Co._: Austin, AMNH 44221-22; Mount Bonnell, 5 mi. S Austin, UMMZ 101453 (10). _Uvalde Co._: 13 mi. from Uvalde, UIMNH 62322. _Val-Verde Co._: 40 mi. N Del Rio, JDL 214 (skeleton). [Illustration: FIG. 11: Distribution of _Syrrhophus marnockii_ (circles). Starred localities are late Pleistocene records.] =Syrrhophus verrucipes= Cope _Syrrhophus verrucipes_ Cope, 1885:383 [Holotype.--ANSP 11325, from near Zacualtipan, Hidalgo, Mexico (1800 feet lower in a rocky gorge of a stream near its junction with the Rio San Miguel), collected by Dr. Santiago Bernard]. Kellogg, 1932:126-29. Smith and Taylor, 1948:52-53. Firschein, 1954:55-57. Gorham, 1966:167. _Syrrhaphus verrucipes_: Guenther, 1900:216-17. _Tomodactylus macrotympanum_ Taylor, 1940e:496-99, pl. 55, figs. 2a-b. [Holotype.--FMNH 100049 (formerly EHT-HMS 6838), from La Placita, 8 km. S Jacala, Hidalgo, Mexico, 1850 m.; collected on July 2, 1936, by Edward H. Taylor]. Smith and Taylor, 1948:47-48. _Syrrhophus macrotympanum_: Dixon, 1957:384. Gorham, 1966:165. _Diagnosis._--Medium-sized frogs, males 17.5-26.1 mm. snout-vent, females 28.0-31.7 mm. snout-vent length; vocal slits in males; digital tips slightly expanded; first finger shorter than second; skin of dorsum pustular, that of venter areolate; snout elongate, subacuminate; diameter of tympanum 56.1-76.7 per cent that of eye in males, 54.3-56.8 in females; in preservative, dorsum reddish brown with numerous small black or dark brown spots (Fig. 8); venter white to cream; in life dorsum green with darker green spots, belly white; iris gold above, bronze below. _Remarks._--Cope's (1885) original description was not sufficiently clear to enable subsequent authors to recognize this species. Taylor (1940e) described it as a _Tomodactylus_, but Dixon (1957) pointed out that _T. macrotympanum_ differed from the other species of the genus in having a poorly developed lumbo-inguinal (inguinal) gland, and placed the species in the genus _Syrrhophus_. Comparison of the holotypes of _S. verrucipes_ and _T. macrotympanum_ leaves no doubt in my mind that a single species is involved. This same species was reported by Smith and Taylor (1948) as _S. verruculatus_. _Syrrhophus verrucipes_ bears resemblance to members of both the _leprus_ and _marnockii_ groups. In snout shape it is closer to the _leprus_ group, whereas in digital pad, the shape of the general body form, and contiguity of habitat it is most similar to the _marnockii_ group (_S. guttilatus_). _Etymology._--Latin, meaning warty foot, probably in reference to the numerous plantar supernumerary tubercles. _Distribution._--Moderate elevations in southeastern San Luis Potosi, Queretaro, and northwestern Hidalgo, Mexico (Fig. 7). _Specimens examined_--(43) MEXICO, _Hidalgo_: Jacala, UMMZ 106434; 9.6 km. NE Jacala, Puerto de la Zorra, 1820 m., KU 60240-41, TCWC 11090, 11147; 8 km. S Jacala, La Placita, 1850 m., FMNH 100049 (holotype of _Tomodactylus macrotympanum_), 100791-803, 105334-35, 114287, UIMNH 15989-92, 15995-96, UMMZ 117252, USNM 137202; Tianguistengo, FMNH 113705-09, UIMNH 13328-30; near Zacualtipan, ANSP 11325 (holotype of _Syrrhophus verrucipes_). _Queretaro_: 3.5 km. S San Juan del Rio, EAL 1343. _San Luis Potosi_: 9.6 km. W Ahuacatlan, LSUMZ 4968-70. =Syrrhophus dennisi= new species _Syrrhophus latodactylus_: Martin, 1958:49 (in part). _Holotype._--UMMZ 101121, adult male from a cave near El Pachon, 8 km. N Antiguo Morelos, Tamaulipas, Mexico, 250 m., collected on March 13, 1949, by Paul S. Martin. _Paratopotypes._--(26). UMMZ 101122 (10), 101123 (2), 101126, 126993 (12). _Diagnosis._--Medium-sized frogs, males 22.8-28.4 mm. snout-vent, females 25.9-32.0 mm. snout-vent; vocal slits in males; digital tips greatly expanded, more than twice width of digit; first finger shorter than second; skin of dorsum shagreened to pustular, that of venter weakly to moderately areolate; toes webbed basally; dorsum light brown to tan with brown vermiculations; venter white; diameter of tympanum 53.9 to 64.2 per cent that of eye in males, 50.6 to 58.7 per cent in females. _Description and variation._--(Fig. 12). Head wider than body; head as wide or wider than long in males, sometimes longer than wide in females; snout acuminate in dorsal view, elongate and rounded in lateral profile; canthus rostralis rounded but distinct; loreal region slightly concave, sloping abruptly to lip; lips not flared; eyelid about two-thirds interorbital distance; length of eye less than distance between eye and nostril; diameter of tympanum 53.9 to 64.2 per cent that of eye in males, 50.6 to 58.7 per cent in females; tympanum round and distinct in both sexes; supratympanic fold moderately distinct; choanae within border of jaws, completely visible from directly below, rounded to slightly oval; dentigerous processes of prevomers and teeth absent; tongue free for posterior one-half, generally oval in outline; vocal slits present in males. Many scattered pustules on dorsum; flanks areolate; skin of venter areolate or not (variability may be due to differences in preservation); ventral disc distinct on chest and lower abdomen; inguinal gland present or not, when present varying from very large and distinct to poorly defined; axillary gland absent. First finger shorter than second; all fingers bearing truncate tips with pads, each pad having a terminal groove; fingers fringed; fingers three and four having dilated pads two to three times width of digit; subarticular tubercles large, conical, rounded, simple; supernumerary tubercles numerous on thenar surface, none on digits; three palmar tubercles, outer slightly smaller than largest supernumerary tubercles; row of tubercles on outer edge of forearm variable, weak to very distinct; tips of toes wider than digits, rounded to truncate at tips, each pad having terminal groove; toes having lateral fringes, bases of toes united by web, web not extending to basal subarticular tubercle; subarticular tubercles smaller than those of hand, round, conical, simple; supernumerary tubercles numerous on plantar surfaces, extending between metatarsal tubercles, present on toes between basal two subarticular tubercles in some specimens; outer metatarsal tubercle round, conical, one-half as large as ovoid, non-compressed inner metatarsal tubercle; tarsal tubercles or folds absent. Ground color pale reddish-brown to tan dorsally, creamy on flanks; dorsal pattern consisting of reddish-brown to brown vermiculations extending onto flanks; distinct interorbital light bar present; loreal region darker than snout, reddish-brown compared to tan or pale reddish-brown; arms colored like dorsum; thighs banded, unicolor brown on posterior surfaces; shanks and tarsi banded; venter white to cream punctated with brown in some specimens. The variation in proportions is summarized in Table 5. _Remarks._--Martin (1958) expressed some doubt that this series of 26 specimens was identical with "_S. latodactylus_." My study indicates that the specimens from El Pachon represent a distinctive but allied species. Males of the two species can be readily separated by the relative sizes of the tympani, presence or absence of vocal slits, and color pattern. Females of the two species can be separated by color pattern. Within the type-series, the pattern varies from weakly to strongly vermiculate but is always recognizable as vermiculate rather than spotted as in _S. longipes_ (= _S. latodactylus_ of Taylor and Martin). [Illustration: FIG. 12: _Syrrhophus dennisi_ sp. nov., holotype, UMMZ 101121 (dorsum x1.8, side of head x6.1).] _Etymology._--The specific name is a patronym for David M. Dennis, whose drawings greatly enhance the worth of this paper. _Distribution._--Known only from the type series. =Syrrhophus longipes= (Baird), New combination _Batrachyla longipes_ Baird, 1859:35, pl. 37, fig. 1-3 [Holotype.--apparently USNM 3237 (cited as 3207 by Cope, 1887:16), now lost, from 40 Leagues from (probably north) Mexico City; collected by John Potts]. Kellogg, 1932:107. _Epirhexis longipes_: Cope, 1866:96. _Eleutherodactylus longipes_: Kellogg, 1932:107 (part). Smith and Taylor, 1948:61. Lynch, 1963:580-581. Gorham, 1966:82. _Syrrhophus latodactylus_ Taylor, 1940d:396-401, pl. 43, figs. A-F, text fig. 7 [Holotype.--FMNH 100063 (formerly EHT-HMS 6807), from Huasteca Canyon, 15 km. W Monterrey, Nuevo Leon, Mexico, 680 m.; collected on June 20, 1936, by Edward H. Taylor]. Smith and Taylor, 1948:50-52. Martin, 1958:48-50. Gorham, 1966:165. _Diagnosis._--Large frogs, males 22.1-33.2 mm. snout-vent, females 26.8-39.6 mm. snout-vent length; vocal slits lacking in males; digital tips greatly expanded (more than twice the width of digit); first finger shorter than second; skin of dorsum pustular, that of venter smooth; diameter of tympanum in males 61.1-87.2 per cent that of eye, 49.5-72.1 per cent in females; dorsum tan with large or small spots and blotches; limbs banded; interorbital bar or triangle present. _Remarks._--I have applied Baird's _Batrachyla longipes_ to the frog Taylor (1940d) called _Syrrhophus latodactylus_ because the color pattern (Fig. 13) predominant in the southern part of the range agrees with that described (figured) for _Batrachyla longipes_. The color pattern of individuals in the southern part of the range of this species consists of large spots or blotches, whereas in the northwestern part the pattern is made up of smaller spots. In the northeastern part of the range, the pattern is more reduced and tends to consist of heavy flecking. The interorbital bar is narrower in specimens from Nuevo Leon and Tamaulipas and is triangular in specimens from Hidalgo and Queretaro. The status of the name _Batrachyla longipes_ is currently that of a _nomen dubium_ (Lynch, 1963). At that time, I was unaware of the geographic variation in color pattern in _Syrrhophus latodactylus_. The exact type-locality of _Batrachyla longipes_ is not known. If it is 40 Leagues north of Mexico City, the locality would be in an area where the species has a blotched instead of a flecked or spotted pattern. No justifiable evidence was presented to place _Batrachyla longipes_ in _Eleutherodactylus_ instead of _Syrrhophus_. Barbour (1923) and Kellogg (1932) associated another species (_E. batrachylus_) with _longipes_. Taylor (1940a) noted this as a case of misidentification and corrected the error but left _longipes_ in the genus _Eleutherodactylus_. Lynch (1963) noted several points of morphological agreement between _Syrrhophus_ and _B. longipes_ but did not place _longipes_ in _Syrrhophus_. Baird's (1859) figures of the holotype do not illustrate prevomerine teeth, but according to Cope (1866) they were present in the holotype. The digital tips of the frog in the figure are somewhat narrower than those typically seen in _S. latodactylus_. If the specimen was slightly desiccated, as possibly was the case, the digits would appear narrower. There is no evidence contrary to placing _Syrrhophus latodactylus_ in the synonymy of _Batrachyla longipes_. [Illustration: FIG. 13: Dorsal views of _Syrrhophus longipes_ illustrating geographic variation in pattern (left, TCWC 12179, x1.5; right, KU 92572, x1.8); side of head (TCWC 10966, x6).] Application of Baird's name _Batrachyla longipes_ to the species of frog heretofore called _Syrrhophus latodactylus_ poses one serious problem. _Batrachyla longipes_ is the type-species (by original designation) of the genus _Epirhexis_ Cope, 1866, which has priority over _Syrrhophus_ Cope, 1878. If _Batrachyla longipes_ is left in the status of a _nomen dubium_, _Epirhexis_ can be forgotten, for the two names are tied together. However, since it seems almost certain that _Batrachyla longipes_ and _Syrrhophus latodactylus_ are conspecific, the former name should not be left as a _nomen dubium_. _Epirhexis_ never came into general usage (Cope cited the name four times, but no one else has used it), whereas _Syrrhophus_ is well established in the zoological literature. It would serve only to confuse the literature to adhere strictly to the Law of Priority and replace _Syrrhophus_ with _Epirhexis_. Therefore, _Syrrhophus_ is used in this paper, even though _Epirhexis_ has priority. A request for the suppression of _Epirhexis_ Cope, 1866, has been submitted to the International Commission of Zoological Nomenclature (Lynch, 1967). _Etymology._--Latin, meaning long-footed; Taylor's _latodactylus_ refers to the wide digital pads. [Illustration: FIG. 14: Distribution of _Syrrhophus dennisi_ (triangle) and _S. longipes_ (circles).] _Distribution._--Moderate elevations (650 to 2000 meters) along the Sierra Madre Oriental from central Nuevo Leon to northern Hidalgo, Mexico (Fig. 14). _Specimens examined._--(122) MEXICO, _Hidalgo_: 3 km. NE Jacala, AMNH 52977; 9.6 km. NE Jacala, 1800 m., TCWC 10966-70, 12179; 8 km. S Jacala, La Placita, 1850 m., FMNH 100266-68, 103244, UIMNH 13291, 13327. _Nuevo Leon_: Salto Cola de Caballo, KU 92572; Huasteca Canyon, 15 km. W Monterrey, 680 m., FMNH 100063 (holotype of _S. latodactylus_), UIMNH 13290; 6.5 km. N Pablillo, EAL 1319; Sabinas Hidalgo, USNM 139728. _Queretaro_: Cueva de los Riscos, 8 km. SW Jalpan, KU 106300. _San Luis Potosi_: 13 km. E Santa Barberita, LSUMZ 2295; second camp, San Luis Potosi road, UIMNH 13326; Xilitla, Cueva sin nombre, UMMZ 125892. _Tamaulipas_: 4 km. W El Carrizo, 500 m., UMMZ 111343 (31); 8 km. N Chamal, Bee Cave, KU 106299; 14.5 km. NNW Chamal, 420 m., UMMZ 111339-40, 111342 (4), 111344 (11); 19 km. NNW Chamal, 700 m., UMMZ 111341 (3); El Chihue, 1880 m., UMMZ 111289 (4); 11 km. N Gomez Farias, 1060 m., UMMZ 101166; 11 km. WNW Gomez Farias, 1800 m., UMMZ 108507 (3); 8 km. NW Gomez Farias, 1060-1400 m., LSUMZ 11085, UMMZ 101167 (3), 101168 (4), 101169 (2), 101170 (3), 101171 (2), 101360-61, 102860, 102933 (4), 102934 (2), 102935-38, 102939 (2), 102940-43, 108800 (3), 110735, 111345-46. =Syrrhophus pipilans= Taylor _Syrrhophus pipilans_ Taylor, 1940c:95-97, pl. 1 [Holotype.--FMNH 100072 (formerly EHT-HMS 6843), 14.6 km. S Mazatlan, Guerrero, Mexico; collected on July 22, 1936, by Edward H. Taylor]. _Diagnosis._--Medium sized frogs, males 22.6-28.5 mm. snout-vent, females 21.1-29.4 mm. snout-vent length; vocal slits present in males; finger tips slightly expanded, truncate in outline; inner metatarsal tubercle less than twice the size of outer; skin of dorsum smooth to shagreened, that of venter smooth; tympanum 36.5-54.0 per cent diameter of eye; dorsum dark brown with large or small light brown, orange-brown, or yellowish spots or blotches; limbs banded; interorbital bar absent. [Illustration: FIG. 15: Dicegrams of ear size relative to eye diameter in the two subspecies of _Syrrhophus pipilans_. N = 17 in _nebulosus_, 18 in _pipilans_.] _Remarks._--Two subspecies were recognized by Duellman (1958). Previously both had been treated as species. The two populations were distinguished on the basis of color pattern and the size of the tympanum. Measurements of 17 males of _S. p. nebulosus_ from central Chiapas and 18 males of _S. p. pipilans_ from southcentral Oaxaca and Guerrero, Mexico, demonstrates that the supposed difference in tympanum size is not significant (Fig. 15). There is, however, a tendency for the western population of _S. pipilans_ to have larger tympani. Based on the present examination of 112 specimens of this species the two populations are held to be sufficiently distinct to warrant taxonomic recognition as subspecies (Fig. 16). [Illustration: FIG. 16: _Syrrhophus pipilans nebulosus_ (left, KU 58908) and _S. p. pipilans_ (right, KU 86885). x2.7.] The parotoid glands attributed to this species by Taylor (1940c:95) are merely the superficial expression of the _m. depressor mandibulae_ and scapula. No true glands are present in the parotoid region. =Syrrhophus pipilans nebulosus= Taylor _Syrrhophus nebulosus_ Taylor, 1943:353-55, pl. 27, figs. 3-5 [Holotype.--FMNH 100095 (formerly EHT-HMS 3774), near Tonola, Chiapas, Mexico; collected on August 27, 1935, by Hobart M. Smith and Edward H. Taylor]. Smith and Taylor, 1948:49, 51. _Syrrhophus pipilans nebulosus_: Duellman, 1958:2-4, 9, 12, 14. Stuart, 1963:32-33. Gorham, 1966:166-67. _Diagnosis._--Diameter of tympanum 36.6-47.8 per cent that of eye; dorsum dark brown with numerous small light brown to yellowish spots. _Remarks._--The distribution of this subspecies is adequately described by Duellman (1958). Fouquette (1960) described the vocalization of this frog. _Etymology._--Latin, _nebula_, in reference to the clouded dorsal pattern. _Distribution._--Low to moderate elevations along the Pacific versant of Chiapas and in the Grijalva valley of Chiapas and Guatemala (Fig. 17). _Specimens examined._--(54) GUATEMALA, _Huehuetenango_: Jacaltenango, UMMZ 117036; 35 km. SE La Mesilla, TNHC 29652. MEXICO, _Chiapas_: 11.2 km. N Arriaga, 300 m., UMMZ 125891; 11.8 km. N Arriaga, UMMZ 117279; 12.8 km. N Arriaga, UMMZ 117280; 17.5 km. S Arriaga, UIMNH 57108-109; 1.5 km. S Bochil, 1250 m., KU 58898-908; Cerro Hueco, 7 km. S Tuxtla Gutierrez, UMMZ 123007; 3.2 km. S Ixtapa, UMMZ 124000; Linda Vista, ca. 2 km. NW Pueblo Nuevo Solistahuacan, KU 58897; Hda. Monserrate, 40 km. NW Arriaga, UMMZ 102258; near San Ricardo, FMNH 100720; Tapachula, FMNH 75792, 103242, 100695-96, UIMNH 13292; 56 km. E Tapanatepec, Oaxaca, TNHC 26942, Tonola, FMNH 100095 (holotype), 100686-92, UIMNH 13293-95; Tuxtla Gutierrez, FMNH 100693-94, UIMNH 13297; 19 km. N Tuxtla Gutierrez, TNHC 25229-30; 15.5 km. NE Tuxtla Gutierrez, UMMZ 119892 (3); 19 km. NE Tuxtla Gutierrez, UMMZ 119891 (3); 8 km. NNW Tuxtla Gutierrez, KU 37809; Union de Juarez, FMNH 105294. =Syrrhophus pipilans pipilans= Taylor _?Syrrhopus verruculatus_: Gadow, 1905:194. _Syrrhophus pipilans_ Taylor, 1940c:95-97, pl. 1 [Holotype.--FMNH 100072 (formerly EHT-HMS 6843), from 14.6 km. S Mazatlan, Guerrero, Mexico; collected on July 22, 1936, by Edward H. Taylor]. Taylor and Smith, 1945:581-82. Smith and Taylor, 1948:49, 50-51. _Syrrhophus pipilans pipilans_: Duellman, 1958:1-4, 8-9, 13-14, pl. 2, fig. 1. Gorham, 1966:166. _Diagnosis._--Diameter of tympanum 40.6-54.0 per cent that of eye; dorsum dark brown with large light spots or blotches. _Remarks._--Duellman's (1958) synopsis of this subspecies is adequate; the distribution has not been extended, but several records are now available which fill in gaps. [Illustration: FIG. 17: Distribution of _Syrrhophus pipilans_: _nebulosus_ (open circles) and _pipilans_ (solid circles).] Gadow's (1905) record of _S. verruculatus_ from "Buena Vista, S. Guerrero" is most likely applicable to this species. Gadow simply included the name in a list of the species he had collected during his trip in Mexico (1902-04); no further comment was made on this species although references to _Syrrhopus_ (sic) appear in several places in the paper and would appear to apply to the species he had. _Etymology._--Latin, _pipilo_, chirping, peeping, in reference to the call of the male. _Distribution._--Sea level to about 1800 meters along the Pacific versant of western Mexico from central Guerrero to the Isthmus of Tehuantepec (Fig. 17). _Specimens examined._--(62). MEXICO, _Guerrero_: Acapulco, UMMZ 110125; 6.4 km. N Acapulco, FMNH 100389, 100525; Agua del Obispo, 980-1000 m., FMNH 75791, 100518-21, 100526, KU 86884-86, UIMNH 13315, UMMZ 119152, 125890 (4); 13.3 km. NW Coyuca, UIMNH 38367, 71982-83; 14.5 km. S Mazatlan, FMNH 100072 (holotype), 100408, 100511-17, UIMNH 13302-309; Tierra Colorado, 300 m., KU 67961, UIMNH 13313-14; near El Treinte, FMNH 126639; Xaltinanguis, FMNH 100522-24, 126640. _Oaxaca_: Cacahuatepec, UIMNH 52853; 8 km. NW Rio Canoa, 53 km. ESE Cuajinicuilapa, UIMNH 52852; 6.4 km. N El Candelaria, UIMNH 9501; 11.2 km. S El Candelaria, UIMNH 9502; 17 km. NE Juchatengo, 1600 m., KU 86887; 31.5 km. N Pochutla, UMMZ 123999 (2); 32.9 km. N Pochutla, 850 m., UMMZ 123996; 37.1 km. N Pochutla, UMMZ 123998 (2); 41.4 km. N Pochutla, UMMZ 123997 (2); Cerro Quiengola, FMNH 105653; 3.8 km. N Santiago Chivela, UMMZ 115449; 14.5 km. W Tehuantepec, UMMZ 115448 (2). =Syrrhophus interorbitalis= Langebartel and Shannon _Syrrhophus interorbitalis_ Langebartel and Shannon, 1956: 161-65, figs. 1-2 [Holotype.--UIMNH 67061 (formerly FAS 9378), 36 mi. N Mazatlan, Sinaloa, Mexico, collected on November 17, 1955, by E. C. Bay, J. C. Schaffner, and D. A. Langebartel]. Duellman, 1958:1-4, 10, 12, 14. Gorham, 1966:164-65. _Syrrhophis interorbitalis_: Campbell and Simmons, 1962:194, fig. 1. [Illustration: FIG. 18: Left to right. _Syrrhophus interorbitalis_ (UIMNH 38095, x1.5), _S. nivocolimae_ (LACM 3203, x1.3), and _S. teretistes_ (KU 75263, x1.5).] _Diagnosis._--Medium sized frogs, only known male 25.6 mm. snout-vent, females 20.0-26.7 mm. snout-vent length (small sample); vocal slits in males; finger tips expanded; first finger shorter than second; outer metatarsal tubercle one-third size of inner; skin of dorsum shagreened, that of venter smooth; diameter of tympanum 37.7-42.4 per cent that of eye in both sexes; pale yellow-brown ground color mottled with brown; limb bands broad, much wider than narrow light interspaces; interorbital bar very long, edged with dark brown to black (Fig. 18). _Remarks._--Duellman's (1958) measurements and proportions of _S. interorbitalis_ were based exclusively on the type series, which is composed of only females; therefore his _interorbitalis_ data are not comparable with the data for the other species in his table. Campbell and Simmons (1962) collected the only known male. The type series was collected beneath rocks in a stream bed; the collectors heard calling frogs in the bushes but were unable to obtain specimens (Langebartel and Shannon, 1956). Campbell and Simmons (1962) reported that their specimen had a poorly developed interorbital bar in life; in preservative the bar compares favorably with the bar in the female (Fig. 18). _Etymology._--Latin, in reference to the pale interocular band. _Distribution._--Pacific lowlands of Sinaloa, Mexico (Fig. 20). _Specimens examined._--(10). MEXICO, _Sinaloa_: 36 mi. N Mazatlan, UIMNH 38094-96, 67061 (holotype), 71970-74; 65 mi. N Mazatlan, LACM 13773. =Syrrhophus modestus= Taylor _Syrrhophus modestus_ Taylor, 1942:304-06, pl. 29 [Holotype.--FMNH 100048 (formerly EHT-HMS 3756), from Hacienda Paso del Rio, Colima, Mexico; collected on July 8, 1935, by Hobart M. Smith]. Smith and Taylor, 1948:49-50. _Syrrhophus modestus modestus_: Duellman, 1958:2-5, 7, 14, pl. 1, fig. 1. Gorham, 1966:166. _Diagnosis._--Small frogs, males 15.8-20.1 mm. snout-vent length, single female 18.5 mm.; vocal slits present in males; finger tips widely expanded; first finger shorter than second; inner metatarsal tubercle about three times size of outer; skin of dorsum shagreened, that of venter smooth; tympanum concealed; pale cream in preservative with dark brown spots; limbs banded; bands on forearm and thigh poorly developed or absent; interorbital bar absent. _Remarks._--The tympanum is concealed in _S. modestus_, _S. nivocolimae_, _S. pallidus_, _S. teretistes_, and to a lesser degree in _S. interorbitalis_. However, if the specimen is permitted to dry slightly, the annulus tympanicus becomes visible through the skin and a tympanum/eye ratio can be computed. One of the few cases of sympatry within the genus _Syrrhophus_ involves this species; _modestus_ and _nivocolimae_ are known to be sympatric at one locality in southwestern Jalisco, Mexico. Duellman (1958) used the trinomial for this population and named a new subspecies, _pallidus_, from Nayarit. I consider _pallidus_ to be specifically distinct from _modestus_ because there is no evidence of genetic exchange, and there is no overlap in the distinguishing morphological features. I do consider the two populations to be closely related but feel the interrelationships between _modestus_, _pallidus_, _nivocolimae_, and _teretistes_ are more complex than would be indicated by the use of trinomials. The sympatric occurrence of _modestus_ and _nivocolimae_ is significant; morphologically, they might otherwise be regarded as subspecies. Although allopatric, similar arguments could be advanced for the morphologically similar _pallidus_ and _teretistes_. The four are here afforded species rank since morphological similarity and allopatry are not sufficient grounds for the assumption of genetic exchange. [Illustration: FIG. 19: _Syrrhophus modestus_ [left, UMMZ 115447 (WED 11155)] and _S. pallidus_ (right, UMMZ 115453). x2.2.] _Etymology._--Latin, meaning unassuming, modest, in reference to the small size of the species. _Distribution._--Low elevations (up to 700 meters) in the lowlands and foothills of Colima and southwestern Jalisco, Mexico (Fig. 20). _Specimens examined._--(14). MEXICO, _Colima_: Hda. Paso del Rio, FMNH 100048 (holotype), 100167, 100299, UIMNH 13300, UMMZ 110877 (2), USNM 139729; 7.2 km. SW Tecolapa, UMMZ 115477 (4); _Jalisco_: 17.6 km. SW Autlan, 606 m., KU 102627; 3.2 km. N La Resolana, UMMZ 102100; Bahia Tenacatita, UMMZ 84264. =Syrrhophus nivocolimae= Dixon and Webb _Syrrhophus nivocolimae_ Dixon and Webb, 1966:1-4, Fig. 1 [Holotype.--LACM 3200, from Nevado de Colima (6 airline miles west of Atenquique), Jalisco, Mexico, 7800 feet; collected on July 20, 1964, by Robert G. Webb]. _Diagnosis._--Small frogs, males 18.5-21.1 mm. snout-vent length, only known female 24.1 mm. snout-vent; vocal slits present in males; finger tips widely expanded; first finger shorter than second; inner metatarsal tubercle about three times size of outer; skin of dorsum warty, that of venter smooth; tympanum concealed, its diameter 30.0-39.3 per cent that of eye in males; mid-dorsal brown band from interorbital bar to anus; bands on limbs narrow, dark bands less than one-half width of light bands, upper arm not banded; narrow interorbital light bar. _Remarks._--This species is closely related to _S. modestus_ and differs in color pattern and degree of wartiness of the skin. Dixon and Webb (1966) held that _nivocolimae_ had no close relatives, but the condition of the tympanum, size, nature of the outer palmar tubercle, relative sizes of the metatarsal tubercles, and shape and size of the digital pads all point to a close relationship between _S. modestus_, _S. nivocolimae_, and _S. pallidus_. [Illustration: FIG. 20: Distribution of the species of the _modestus_ group: _interorbitalis_ (open circles), _teretistes_ (solid circles), _modestus_ (open triangles), _pallidus_ (solid triangles) and _nivocolimae_ (square). Arrow indicates locality of sympatry between _modestus_ and _nivocolimae_. Solid line about the localities for _interorbitalis_ is a range estimate based on call records and specimens examined.] Dixon and Webb (1966) reported that _S. nivocolimae_ has a large tympanum (50.0-59.0 per cent diameter of eye). However, my examination of the type series and several other specimens from Jalisco reveals that the largest tympanum/eye ratio is 39.3 per cent. Therefore, the tympanum/eye ratio in _S. nivocolimae_ is in agreement with those for _S. modestus_, _S. pallidus_, and _S. teretistes_ (Table 6). _Etymology._--_niv_, Latin, and Colima (Nevado de), meaning high on the volcano, in reference to the higher distribution of this species (around 2000 meters) than other members of the group. _Distribution._--Known from southwestern Jalisco, Mexico, at moderate to high elevations (600-2400 meters). _Specimens examined._--(48) MEXICO, _Jalisco_: 17.6 km. SW Autlan, 606 m., KU 102626, 102631; 6.4 km. W Atenquique, 2060 m., KU 102628-30, 102632; 8 km. W Atenquique, 1970 m., LACM 3210-12; 9.6 km. W Atenquique, 2360 m., LACM 3200 (holotype), 3201-09; 14.5 km. W Atenquique, 2000 m., LACM 25424-36, 25439-41, 25446; 15 km. W Atenquique, LACM 37044-46, 37244-47; 16 km. W Atenquique, 2105 m., LACM 25443-45; 17 km. W Atenquique, 2180 m., LACM 25442. =Syrrhophus pallidus= Duellman, New combination _Syrrhophus modestus_: Davis and Dixon, 1957:146. _Syrrhophus modestus pallidus_ Duellman, 1958:2-3, 5-7, 14, pl. 3 [Holotype.--UMMZ 115452, from San Blas, Nayarit, Mexico, sea level; collected on August 13, 1956, by William E. and Ann S. Duellman]. Zweifel, 1960:86-88, 91, 93-94, 118, 120-22. Gorham, 1966:166. _Syrrhophis modestus pallidus_: Campbell and Simmons, 1962:194. _Diagnosis._--Small frogs, males 17.9-19.3 mm. snout-vent length; vocal slits in males; finger tips widely expanded; first finger shorter than second; inner metatarsal tubercle about three times size of outer; skin of dorsum shagreened, that of venter smooth; tympanum concealed, its diameter 27.0-35.6 per cent of eye in males; ground color cream vermiculated with brown, upper arm and thigh lacking, or with few, indistinct, bands; interorbital bar absent. _Remarks._--Considerable debate has been waged relative to the value of subspecies and to the reasons for recognizing distinct disjunct populations as species versus subspecies. Lacking evidence of genetic exchange, I prefer to retain disjunct populations that are distinctive as species. All known specimens of _pallidus_ can be separated from those of _modestus_ by color pattern. The two nominal species exhibit overlap in proportions but the same can be said about nearly every species of _Syrrhophus_; therefore, overlap in proportions can be disregarded in assessing specific versus subspecific rank. Until contrary evidence is forthcoming, I consider the disjunct populations heretofore held to be subspecies of _modestus_ to be specifically distinct. The specimens of the disjunct population of _pallidus_ on the Tres Marias do not differ from the mainland population in Nayarit. This evidence, though perhaps secondary, supports my contention that two species should be recognized. _Etymology._--Latin, in reference to the pale ground color in comparison with that of _S. modestus_. _Distribution._--Low elevations in coastal Nayarit and on Islas Tres Marias (Fig. 20). _Specimens examined._--(12) MEXICO, _Nayarit_: 18.8 mi. NW Ahuacatlan, UIMNH 7808; San Blas, UMMZ 115452 (holotype), 115453-57; 17 km. NE San Blas, 150 m., MSU 5085; 12.8 km. E San Blas, UIMNH 71979; 31 km. E San Blas, UIMNH 71978; 13.5 km. N Tepic, UIMNH 71980-81. =Syrrhophus teretistes= Duellman _Syrrhophus teretistes_ Duellman, 1958:2-3, 10-14, pl. 2, fig. 2 [Holotype.--UMMZ 115451, from 4.8 km. NW Tepic, Nayarit, Mexico, 840 m.; collected on August 12, 1956, by William E. Duellman]. Gorham, 1966:167. _Diagnosis._--Medium-sized frogs, males 19.2-23.2 mm. snout-vent length, single known female 24.8 mm. snout-vent; vocal slits in males; finger tips widely expanded; first finger shorter than second; inner metatarsal tubercle about three times size of outer; skin of dorsum shagreened, that of venter smooth; tympanum partially concealed, its diameter 28.6-43.8 per cent of eye in males; ground color brown vermiculated with dark brown to nearly black; upper arm and thigh banded; interorbital light bar absent. _Remarks._--_S. teretistes_ appears to be most closely related to _S. pallidus_; I consider it to be an upland derivative of _pallidus_. Morphologically, the differences between the two are few, but lacking evidence of genetic exchange they are retained as species. _Etymology._--Greek, in reference to the whistle-like nature of the call. _Distribution._--Moderate elevations (840-1200 meters) in the Sierra Occidental of Nayarit, Sinaloa, and Durango, Mexico (Fig. 20). _Specimens examined._--(13) MEXICO, _Nayarit_: 4.8 km. NW Tepic, 840 m., UMMZ 115451 (holotype). _Sinaloa_: Santa Lucia, 1090 m., KU 75263-72; 1 km. NE Santa Lucia, 1156 m., KU 78257; 2.2 km. NE Santa Lucia, 1156 m., KU 78258. DISCUSSION There are relatively few clear-cut morphological differences among the fourteen species now assigned to _Syrrhophus_. The majority of the species are allopatric and differ primarily in color patterns. Sympatric occurrence serves as an indicator of specific distinctness and is one of the more practical tests of species validity when cross-breeding experiments are not possible. Two cases of sympatric occurrence are known for the species of _Syrrhophus_ in western Mexico: _modestus_ and _nivocolimae_ are sympatric in southern Jalisco and _pipilans nebulosus_ and _rubrimaculatus_ are sympatric in southeastern Chiapas. In eastern Mexico, _longipes_ and _verrucipes_ are sympatric in southern Hidalgo, and _longipes_ is sympatric with _cystignathoides_, _dennisi_, and _guttilatus_ in southern Tamaulipas. _Syrrhophus cystignathoides_ and _leprus_ are apparently sympatric in central Veracruz. Subspecific assignments have been made only when there is evidence of intergradation. The sympatric occurrence of morphologically similar species in this genus has led me to adopt a conservative approach to the degree of difference philosophy. I have therefore recognized all morphologically distinct allopatric populations as species. [Illustration: FIG. 21: Generic distributions of _Syrrhophus_ (stipple) and _Tomodactylus_ (hatching). Black areas are zones of intergeneric sympatry.] _Syrrhophus_ is closely allied to another Mexican leptodactylid genus, _Tomodactylus_, which was revised by Dixon (1957), who along with numerous other authors noted the close relationship between the two genera. There is an almost complete lack of sympatry between the two genera; in very few places in Mexico do they coexist (Fig. 21). _Tomodactylus_ has its greatest diversity in the Cordillera Volcanica and Sierra Madre del Sur, whereas _Syrrhophus_ reaches its greatest diversity in the Sierra Madre Oriental and eastern foothills. The species of both genera are about the same size and presumably have similar requirements insofar as food, breeding sites, and habitat selection. Four cases of intergeneric sympatry are known for the two genera: 1) the Chilpancingo region of Guerrero, 2) the lowlands of Colima and the mountains just inland in Jalisco, 3) the lowlands of central Nayarit, and 4) the Sierra Madre Occidental on the Durango-Sinaloan border. The apparent sympatry in the Chilpancingo region involves four species: _S. pipilans_, _T. albolabris_, _T. dilatus_, and _T. nitidus_. Of the four, _T. dilatus_ appears to be completely allopatric in that it occurs at higher altitudes (above 2000 meters), whereas the other three occur below 1800 meters in the region (Davis and Dixon, 1965). In the Colima-Jalisco region, _Tomodactylus_ tends to occur higher (Dixon and Webb, 1966) than some of the _Syrrhophus_, but one subspecies of _Tomodactylus nitidus_ is a lowland frog, occurring sympatrically with the lowland _Syrrhophus modestus_. A similar situation is observed in Nayarit; the lowland _Tomodactylus_ occurs sympatrically with the small _Syrrhophus pallidus_. In both cases the _Syrrhophus_ is smaller than the _Tomodactylus_. [Illustration: FIG. 22: Altitudinal distributions of _Syrrhophus_ and _Tomodactylus_. Widths of the columns are proportional to the numbers of species at a given altitude; narrowest width equals one species.] Frogs of the genus _Syrrhophus_ tend to occur at lower elevations than do their close relatives of the genus _Tomodactylus_ (Fig. 22). This generalization is complicated by the occurrence in the Sierra Madre Oriental in relatively high altitude _Syrrhophus_ (up to 2000 m.) and the occurrence in Michoacan of low altitude _Tomodactylus_ (to sea level). There are no _Tomodactylus_ in the Sierra Madre Oriental, whereas the genus _Syrrhophus_ is represented in the lowlands of western Mexico (_modestus_ group). _Syrrhophus_ and _Tomodactylus_ exhibit essentially parapatric distributions. The two genera as now composed can be characterized as low to moderate elevation frogs (_Syrrhophus_) and moderate to intermediate elevation frogs (_Tomodactylus_). LITERATURE CITED BAIRD, S. F. 1859. Reptiles of the Boundary. United States and Mexican Boundary Survey, pp. 1-35, pls. 1-41. BARBOUR, T. 1923. The reappearance of Batrachyla longipes. Proc. New England Zool. Club, 8:81-83. BARBOUR, T., and A. LOVERIDGE 1946. Typical reptiles and amphibians; supplement. Bull. Mus. Comp. Zool., 96:59-214. BOULENGER, G. A. 1882. Catalogue of the Batrachia Salientia ... British Museum., 2nd ed. 1888. Note on the classification of the Ranidae. Proc. Zool. Soc. London, 1888, pt. 2:204-06. CAMPBELL, H. W., and R. S. SIMMONS 1962. Notes on some reptiles and amphibians from western Mexico. Bull. So. California Acad. Sci., 61:193-203. CONANT, R. 1958. A field guide to reptiles and amphibians. Houghton-Mifflin Co. Boston. 366 pp. COPE, E. D. 1866. On the structures and distribution of the genera of the arciferous Anura. J. Acad. Nat. Sci. Philadelphia, n. ser., 6:67-112. 1877. Tenth contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc., 17:85-98. 1878. New genus of Cystignathidae from Texas. Amer. Nat., 12:252-53. 1879. Eleventh contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc., 18:261-77. 1885. A contribution to the herpetology of Mexico. _Ibid._, 22:379-404. DAVIS, W. B., and J. R. DIXON 1957. Notes on Mexican amphibians, with description of a new _Microbatrachylus_. Herpetologica, 13:145-47. 1965. Amphibians of the Chilpancingo Region, Mexico. _Ibid._, 20:225-33. DIAZ DE LEON, J. 1904. Indice de los Batracios que se enquentran en la Republica Mexicana. Imprenta de Ricardo Rodriquez Romo. Aguascalientes. 40 pp. DIXON, J. R. 1957. Geographic variation and distribution of the genus Tomodactylus in Mexico. Texas J. Sci., 9:379-409. DIXON, J. R., and R. G. WEBB 1966. A new _Syrrhophus_ from Mexico (Amphibia: Leptodactylidae). Cont. Sc., Los Angeles Co. Mus., 102:1-5. DUELLMAN, W. E. 1958. A review of the frogs of the genus _Syrrhophus_ in western Mexico. Occ. Pap. Mus. Zool. Univ. Michigan, 594:1-15. 1960. A distributional study of the amphibians of the Isthmus of Tehuantepec, Mexico. Univ. Kansas Publs. Mus. Nat. Hist., 13:19-72. FIRSCHEIN, I. L. 1954. Definition of some little-understood members of the leptodactylid genus _Syrrhophus_, with a description of a new species. Copeia, (1):48-58. FOUQUETTE, M. J. 1960. Call structure in frogs of the family Leptodactylidae. Texas J. Sci., 12:201-15. GADOW, H. 1905. The distribution of Mexican amphibians and reptiles. Proc. Zool. Soc. London, 1905, pt. 2:191-244. GORHAM, S. W. 1966. Liste der rezenten Amphibien und Reptilien.... Das Tierreich. Lief, 85:1-222. GUeNTHER, A. C. L. G. 1885-1902. Biologia Centrali-Americana. Reptilia and Batrachia. 326 pp., 76 pls. Syrrhophus section dated 1900. KELLOGG, R. 1932. Mexican tailless amphibians in the United States National Museum. Bull. U.S. Natl. Mus., 160. LANGEBARTEL, D. A., and F. A. SHANNON 1956. A new frog (Syrrhophus) from the Sinoloan lowlands of Mexico. Herpetologica, 12:161-65. LYNCH, J. D. 1963. The status of _Eleutherodactylus longipes_ (Baird) of Mexico (Amphibia: Leptodactylidae). Copeia, (3):580-81. 1964. Additional hylid and leptodactylid remains from the Pleistocene of Texas and Florida Herpetologica. 20:141-42. 1967. _Epirhexis_ Cope, 1866 (Amphibia: Salientia): request for suppression under the plenary powers. I. N. (S). Bull. Zool. Nomencl., 24:313-15. 1968. Genera of leptodactylid frogs in Mexico. Univ. Kansas Publs., Mus. Nat. Hist., 17:503-15. MARTIN, P. S. 1958. A biogeography of reptiles and amphibians in the Gomez Farias region, Tamaulipas, Mexico. Misc. Publs. Mus. Zool. Univ. Michigan, 101:1-102. MILSTEAD, W. M., J. S. MECHAM, and H. MCCLINTOCK 1950. The amphibians and reptiles of the Stockton Plateau in northern Terrell County, Texas. Texas J. Sci., 2:543-62. NEILL, W. T. 1965. New and noteworthy amphibians and reptiles from British Honduras. Bull. Florida State Mus., 9:77-130. NIEDEN, F. 1923. Anura I ... Das Tierreich. Lief., 46:1-584. PETERS, W. 1871. Ueber neue Amphibien ... des Konigl. Zoologischen Museums. Monatsb. k. k. Preuss. Akad. Wiss. Berlin, 1870:641-52. SCHMIDT, K. P., and T. F. SMITH 1944. Amphibians and reptiles of the Big Bend Region of Texas. Field Mus. Nat. Hist., zool. ser., 29:75-96. SMITH, H. M. 1947. Notes on Mexican amphibians and reptiles. J. Washington Acad. Sci., 37:408-12. SMITH, H. M., and E. H. TAYLOR 1948. An annotated checklist and key to the Amphibia of Mexico. Bull. U.S. Natl. Mus., 194:1-118. STEJNEGER, L. 1915. A new species of tailless batrachian from North America. Proc. Biol. Soc. Washington, 28:131-32. TAYLOR, E. H. 1940a. A new eleutherodactylid frog from Mexico. Proc. New England Zool. Club, 18:13-16. 1940b. Two new anuran amphibians from Mexico. Proc. U.S. Natl. Mus., 89:43-47, 1 pl. 1940c. A new Syrrhophus from Guerrero, Mexico. Proc. Biol. Soc. Washington, 53:95-98, 1 pl. 1940d. New species of Mexican Anura. Univ. Kansas Sci. Bull., 26:385-405. 1940e. Herpetological miscellany no. I. _Ibid._, 26:489-571. 1942. New Caudata and Salientia from Mexico. _Ibid._, 28:295-323. 1943. Herpetological novelties from Mexico. _Ibid._, 29:343-61. 1952. A review of the frogs and toads of Costa Rica. _Ibid._, 35:577-942. TAYLOR, E. H., and H. M. SMITH 1945. Summary of the collections of amphibians made in Mexico under the Walter Rathbone Bacon Traveling Scholarship. Proc. U.S. Natl. Mus., 95:521-613. TIHEN, J. A. 1960. Notes on Late Cenozoic hylid and leptodactylid frogs from Kansas, Oklahoma and Texas. Southwest. Nat., 5:66-70. WRIGHT, A. H., and A. A. WRIGHT 1949. Handbook of frogs and toads. 3rd ed. Comstock. 640 pp. YARROW, H. C. 1882. Checklist of North American Reptilia and Batrachia, with catalogue of specimens in U.S. National Museum. Bull. U.S. Natl. Mus., 24:1-249. ZWEIFEL, R. G. 1960. Results of the Puritan-American Museum of Natural History Expedition to Western Mexico. 9. Herpetology of the Tres Marias Islands. Bull. Amer. Mus. Nat. Hist., 119:81-128. TRANSCRIBER'S NOTES Although _Syrrhophus marnocki_ and _Syrrhophus marnockii_ both appear in this text, a literature search shows that both spellings have been used and the two instances where there is only one "i" at the end are in reference to priviously published names. Therefore, they were left as is. With the exception of the list below and a number of silent corrections, the text presented is that of the original printed version. Typographical Corrections Page Correction ==== ====================== 3 otherwse => otherwise 5 poltypic => polytypic 12 interorbtal => interorbital 14 neublosus => nebulosus 16 Cuidad => Ciudad 16 1946-170 => 1946:170 22 rubrimacultaus => rubrimaculatus 27 resemblence => resemblance Text Emphasis _Text_ - Italics =Text= - Bold End of the Project Gutenberg EBook of A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope, by John D. Lynch *** END OF THIS PROJECT GUTENBERG EBOOK A TAXONOMIC REVISION OF THE *** ***** This file should be named 37809.txt or 37809.zip ***** This and all associated files of various formats will be found in: http://www.gutenberg.org/3/7/8/0/37809/ Produced by Chris Curnow, Tom Cosmas, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net Updated editions will replace the previous one--the old editions will be renamed. 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