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A New Species of Wood Rat (Neotoma) from Northeast

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

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 Potosi, Mexico). Additional specimens from southwestern Tamaulipas, obtained in recent years by representatives of the Museum of Natural History, along with specimens from parts of Nuevo Leon and Coahuila, represent an unnamed subspecies, which is named and described as follows:

=Neotoma albigula subsolana= new subspecies

_Type._--Male, adult, skin and skull, No. 56950, Museum of Natural History, The University of Kansas, from Miquihuana, 6400 ft., Tamaulipas; obtained on July 20, 1953, by Gerd H. Heinrich, original number 7553B.

_Geographic distribution._--Sierra Madre Oriental from southeastern Coahuila to southwestern Tamaulipas.

_Diagnosis._--Over-all size small for species (see measurements), but tail, maxillary tooth-row and incisive foramina relatively long; upper parts dark (individual hairs banded subterminally with cinnamon and tipped with grayish, yielding an over-all color of grayish brown); lips gray, especially anteriorly and medially; alveoli of incisors narrow (4.8-5.2); posterior branch of premaxilla extending only slightly behind nasals; rostrum short; braincase broad; mastoid breadth averaging 51.1 (47.8-52.7) per cent of basilar length.

_Comparisons._--_Neotoma albigula subsolana_, differs from topotypes of _N. a. leucodon_, the subspecies geographically adjacent to the southwest, as follows: size smaller, especially length of palatal bridge (6.9-8.1 instead of 8.2-9.6), alveolar length of maxillary tooth-row (8.3-8.9 instead of 8.8-9.7), and greatest length of auditory bulla (7.3-7.9 instead of 8.2-8.9); mastoid breadth relatively greater, 51.1 (47.8-52.7) instead of 47.0 (45.5-49.1) per cent of basilar length; posterior process of premaxilla extending only slightly beyond posterior border of nasals; auditory bulla conspicuously smaller; upper parts darker, especially middorsally; over-all color grayish instead of ochraceous or yellowish; lips gray instead of nearly white.


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