The Project Gutenberg EBook of A New Bog Lemming (Genus Synaptomys) From Nebraska, by J. Knox Jones 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 New Bog Lemming (Genus Synaptomys) From Nebraska Author: J. Knox Jones Release Date: January 9, 2010 [EBook #30898] Language: English Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK BOG LEMMING (GENUS SYNAPTOMYS) *** Produced by Chris Curnow, Joseph Cooper and the Online Distributed Proofreading Team at https://www.pgdp.net A New Bog Lemming (Genus Synaptomys) From Nebraska BY J. KNOX JONES, JR. =University of Kansas= =Lawrence= 1958 =University of Kansas Publications= =Museum of Natural History= Volume 9, No. 13, pp. 385-388 May 12, 1958 Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Robert W. Wilson PRINTED IN THE STATE PRINTING PLANT TOPEKA, KANSAS 1958 27-3033 A New Bog Lemming (Genus Synaptomys) From Nebraska BY J. KNOX JONES, JR. In the autumn of 1952, I obtained a southern bog lemming, _Synaptomys cooperi_, at Rock Creek State Fish Hatchery, Dundy County, in extreme southwestern Nebraska. This locality of record is the westernmost for the species in North America. Subsequently, I reported this specimen in the literature (Univ. Kansas Publ., Mus. Nat. Hist., 7:486, 1954), provisionally assigning it to _Synaptomys cooperi gossii_, the subspecies occurring in eastern Nebraska. In late November of 1956, J. R. Alcorn collected three additional bog lemmings at the Rock Creek Hatchery. These specimens from Dundy County represent a relict population that differs in several characteristics from _S. c. gossii_, and that differs also from all other subspecies of the species. This relict population is, therefore, here given subspecific recognition. #Synaptomys cooperi relictus#, new subspecies _Type._--Adult female, skin and skull, University of Kansas Museum of Natural History no. 51617, from Rock Creek State Fish Hatchery, 5 mi. N, 2 mi. W Parks, Dundy County, Nebraska; obtained November 1, 1952, by J. Knox Jones, Jr., original no. 995. _Distribution._--Known only from the type locality. _Diagnosis._--Size large for the species, both externally and cranially; dorsal pelage dark; nasals broadly flared anteriorly (especially broad in relation to nasal length); auditory bullae small; molariform tooth-rows and incisive foramina long. _Measurements (in millimeters)._--External measurements of the type specimen, followed by those of another adult female (KU 72603), are: Total length, 141, 145; length of tail-vertebrae, 24, 21; length of hind foot, 20, 20; length of ear from notch, 11, 12. The type specimen weighed 46.3 grams. Cranial measurements were taken in the manner described by Wetzel (Jour. Mamm., 36:2-3, 1955) except that he did not record the occipitonasal length. These cranial measurements of the type and KU 72603 are: Occipitonasal length, 30.2, 29.8; condylobasilar length, 27.2, 27.1; zygomatic breadth, 18.1, 17.9; lambdoidal breadth, 14.2, 13.8; length of nasals, 8.2, 8.3; breadth of nasals, 4.2, 4.0; length of rostrum, 6.6, 6.6; breadth of rostrum, 6.1, 5.9; breadth of upper incisors, 4.6, 4.2; length of maxillary tooth-row, 8.5, 8.4; length of incisive foramen, 5.8, 5.5; interorbital breadth, 3.1, 3.5. _Comparisons._--From _Synaptomys cooperi gossii_ (specimens from eastern Nebraska and eastern Kansas, including one topotype), _S. c. relictus_ differs in: Dorsal coloration, in comparable pelages, darker, venter lacking buffy tinge; skull averaging larger in all cranial dimensions (except rostral length, which is approximately the same), especially breadth of upper incisors and length of molariform tooth-rows; nasals broader anteriorly; auditory bullae nearly equal in size, thus relatively smaller. From _Synaptomys cooperi paludis_ (holotype and paratypes) of Meade County, Kansas, _S. c. relictus_ differs in: Skull averaging smaller in all cranial measurements except rostral length and breadth of upper incisors, which are approximately the same, and breadth of nasals, length of incisive foramina and length of molariform tooth-rows, which measure more; nasals relatively (48 per cent of length of nasals) as well as actually broader anteriorly; anterior border of zygomatic plate more concave; auditory bullae smaller; infraorbital foramina larger when viewed anterolaterally. _S. c. relictus_ closely resembles _S. c. paludis_ in color and external proportions. _Remarks._--The total population of _Synaptomys cooperi relictus_ may be small because the only suitable habitat known to me for these mice is the dense, grassy area, approximately 100 yards wide and one mile long, around some of the rearing ponds and along the creek at Rock Creek Hatchery. It has been taken there in association with _Cryptotis parva parva_, _Blarina brevicauda carolinensis_, _Reithrodontomys megalotis dychei_, _Peromyscus maniculatus nebrascensis_, _Microtus ochrogaster haydenii_, and another relic, _Microtus pennsylvanicus finitis_. All specimens of the newly named bog lemming are from the border zone between the wet-substrate habitat of _M. p. finitis_ and the drier habitat occupied by _M. o. haydenii_. Approximately 3000 trap nights produced the four known specimens. _S. c. relictus_, like _S. c. paludis_, represents a relict population of the more southwesterly distribution of the subgenus _Synaptomys_ during Wisconsin and post-Wisconsin times. Additional relict populations likely will be found in the eastern Great Plains. The new subspecies is intermediate in some features between _paludis_ and _gossii_. The type locality is separated from that of _paludis_ (14 mi. SW Meade, Meade County, Kansas) by a distance of approximately 220 miles over habitats largely unsuitable for bog lemmings. The nearest locality of record for S. c. _gossii_ to the east of the type locality of _relictus_ is at Hunter, Mitchell County, Kansas (see Cockrum, Univ. Kansas Publ., Mus. Nat. Hist., 7:196, 1952), approximately 200 miles distant. The locality of record of _gossii_ in Nebraska nearest to the type locality of _relictus_ is even farther eastward--1 mi. N Pleasant Dale, Seward County (KU 50188). _Specimens examined._--Four, from the type locality (KU 51617, 72601-03). _Transmitted March 11, 1958._ End of the Project Gutenberg EBook of A New Bog Lemming (Genus Synaptomys) From Nebraska, by J. 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