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قراءة كتاب A New Species of Wood Rat (Neotoma) from Northeastern Mexico

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

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

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دار النشر: Project Gutenberg
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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 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

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.

Neotoma albigula subsolana differs from N. a. albigula, geographically adjacent to the northwest (specimens from Pima County, Arizona) as follows: size averaging slightly larger, except length of nasals; mastoid breadth averaging 18.8 (17.9-20.2) instead of 17.9 (17.7-18.2), its ratio to basilar length therefore greater, 51.1 (47.8-52.7) instead of 49.4 (47.9-50.0); zygomatic arches expanded posteriorly instead of nearly parallel as in albigula; interparietal longer and

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