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Title: A New Species of Wood Rat (Neotoma) from Northeastern Mexico

Author: Ticul Alvarez

Release Date: December 30, 2011 [EBook #38441]

Language: English

Character set encoding: ISO-8859-1

*** START OF THIS PROJECT GUTENBERG EBOOK A NEW SPECIES OF WOOD RAT ***




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University of Kansas Publications
Museum of Natural History

Volume 14, No. 11, pp. 139-143
April 30, 1962

A New Subspecies of Wood Rat
(Neotoma) from Northeastern Mexico

BY

TICUL ALVAREZ

University of Kansas
Lawrence
1962

University of Kansas Publications, Museum of Natural History

Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Theodore H. Eaton, Jr.

Volume 14, No. 11, pp. 139-143
Published April 30, 1962

University of Kansas
Lawrence, Kansas

PRINTED BY
JEAN M. NEIBARGER, STATE PRINTER
TOPEKA, KANSAS
1962
29-2891

[141]

A New Subspecies of Wood Rat
(Neotoma) from Northeastern Mexico

BY

TICUL ALVAREZ

The White-throated woodrat, Neotoma albigula, has been known previously from the Mexican state of Tamaulipas by only eight individuals reported by Goldman (N. Amer. Fauna, 31:37, October 19, 1910), which were assigned to Neotoma albigula leucodon (type locality, city of San Luis Potosí, México). Additional specimens from southwestern Tamaulipas, obtained in recent years by representatives of the Museum of Natural History, along with specimens from parts of Nuevo León and Coahuila, represent an unnamed subspecies, which is named and described as follows:

Neotoma albigula subsolana new subspecies

Remarks.—N. a. subsolana is characterized by the combination of small size, dark color, small auditory bulla and relatively broad braincase. Typical specimens have been collected only at higher elevations in the Sierra Madre Oriental where no other species of Neotoma is known to occur.

Intergradation between N. a. subsolana and N. a. leucodon occurs at lower elevations on the west side of the Sierra Madre Oriental as shown by specimens from nine miles southwest of Tula, Tamaulipas, and Sierra Guadalupe, Coahuila, from which places some specimens are paler than others, approaching leucodon in color, and are slightly larger than typical subsolana. Specimens assigned to leucodon from vicinity of Presa Guadalupe and from 1 to 6 kilometers south of Matehuala, San Luis Potosí, are typical of that subspecies in measurements but are darker than topotypes.

N. a. subsolana intergrades with N. a. albigula in southeastern Coahuila (specimens from 6 to 9 miles east of Hermanas and from Panuco) where some individuals average paler and smaller than topotypes of subsolana and some have skulls that combine characters of subsolana and albigula. These specimens, which were referred to N. a. leucodon by Baker (Univ. Kansas Publ., Mus. Nat. Hist., 9:281-282, June 15, 1956), are assigned to subsolana on the basis of relatively dark upperparts and broad mesopterygoid fossa (narrow in only one specimen).

On geographic grounds, specimens not studied by me from Municipio de Galeana, Nuevo León (Koestner, Great Basin Nat., 2:13, 1941), and those from Jaumave, Tamaulipas (Goldman, N. Amer. Fauna, 31:37, October 19, 1910), probably are referable to N. a. subsolana.

The subspecific name subsolana (Latin adjective for eastern) is proposed for this woodrat because of its eastern geographic occurrence.

[143]

I am grateful to Prof. E. Raymond Hall and Mr. J. Knox Jones, Jr., for permission to examine critical specimens and for helpful suggestions. I am grateful also to Dr. George H. Lowery, Jr., of the Louisiana State University (LSU) and to Dr. David H. Johnson and Dr. Richard H. Manville of the United States National Museum (USNM) for the loan of specimens. Gerd H. Heinrich (in 1953) and Percy L. Clifton (in 1961) collected for the Museum of Natural History the Tamaulipan specimens herein reported. Fieldwork was supported by the Kansas University Endowment Association. Laboratory phases of the study were made when the author was a half-time Research Assistant supported by grant No. 56 G 103 from the National Science Foundation.

29-2891

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