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قراءة كتاب A New Pocket Gopher (Thomomys) and A New Spiny Pocket Mouse (Liomys) from Michoacán, Mexico
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A New Pocket Gopher (Thomomys) and A New Spiny Pocket Mouse (Liomys) from Michoacán, Mexico
A New Pocket Gopher (Thomomys) and A New
Spiny Pocket Mouse (Liomys) from
Michoacán, Mexico
BY
E. RAYMOND HALL AND BERNARDO VILLA R.
University of Kansas Publications
Museum of Natural History
Volume 1, No. 14, pp. 249-256, 6 figs. in text
July 26, 1948
University of Kansas
LAWRENCE
1948
University of Kansas Publications, Museum of Natural History
Editors: E. Raymond Hall, Chairman; A. Byron Leonard,
Edward H. Taylor
Volume 1, No. 14, pp. 249-256, 6 figs. in text
July 26, 1948
University of Kansas
Lawrence, Kansas
PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1948
22-3338
A New Pocket Gopher (Thomomys) and a New Spiny
Pocket Mouse (Liomys) from Michoacán, Mexico
By
E. RAYMOND HALL and BERNARDO VILLA R.
A series of 17 pocket gophers of the species Thomomys umbrinus obtained in 1943 from points 3, 4 and 5 miles south of Pátzcuaro proves upon comparison to be an hitherto unrecognized subspecies which is described and named as follows:
Thomomys umbrinus pullus, new subspecies
Type.—Male, adult, skin and skull; No. 100151, Univ. California Mus. Vert. Zool.; 5 mi. S Pátzcuaro, 7800 ft., Michoacán, Mexico; March 10, 1943; obtained by Hubert H. Hall, original No. 117.
Range.—Known only from 3 to 5 miles south of Pátzcuaro, Michoacán.
Diagnosis.—Size small (see measurements); color black or between Cinnamon-Brown and Snuff Brown; distal half of tail whitish and all of tail whitish in one specimen; lambdoidal crests perpendicular to sagittal plane of skull; posteroventral face of tympanic bulla rugose; jugal vertical (flat surface not oblique); interpterygoid space truncate at apex with sides curved outward (see figure).
Comparison.—From topotypes of Thomomys umbrinus supernus Nelson and Goldman, pullus differs as follows: More individuals wholly black (except distal half of tail); underparts lacking white; rostrum broader; braincase anteriorly slightly more expanded dorsally; lambdoidal crests perpendicular to sagittal plane rather than inclined posteromediad; interparietal broader, ♂ 5.7 (5.0-7.0) versus 4.5, and in ♀ 6.5 (5.6-7.1) rather than 4.8 (4.4-5.1); flattened middle part of jugal vertical rather than oblique; in side view, mastoid and paroccipital processes farther apart thus exposing larger surface of mastoidal bulla; incisors, in both upper and lower jaws, slightly narrower; molariform teeth smaller, interpterygoid space truncate, at apex, with sides convex mediad, rather than V-shaped; ventral face of tympanic bullae rugose in posterior half rather than smooth.
Remarks.—Among named subspecies of Thomomys umbrinus, T. u. pullus most closely resembles T. u. supernus, the subspecies next adjacent to the northward. Therefore, the results of comparisons with only that subspecies are here reported upon. T. u. tolucae to the eastward is for one thing a much larger animal and has