The Project Gutenberg eBook of A New Pocket Gopher (Genus Thomomys) From Wyoming and Colorado n5c6r by E. Raymond Hall.

Among small mammals accumulated, from Wyoming, in the Museum of Natural History of the University of Kansas, specimens of the wide-spread species Thomomys talpoides are abundantly represented. Subspecific names are available for most of these, but specimens from the Sierra Madre Mountain Range of Wyoming and Colorado prove upon comparison to pertain to an heretofore unnamed subspecies which may be described and named as follows:

Type.—Male, adult, skull and skin, no. 25628 Mus. Nat. Hist. Univ. Kansas; from 8 mi. N and 19-½ mi. E Savery, 8800 ft., Carbon County, Wyoming; obtained on July 19, 1948, by George M. Newton; original no. 4.

Range.—Sierra Madre Mountain Range of southern Wyoming and northern Colorado.

Diagnosis.—Size small (see measurements); color dark, upperparts in worn pelage of July darker than (near, n) Raw Umber (capitalized are of Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912) and in fresh pelage of August between (near, 16') Prout's Brown and Mummy Brown; skull small; relative to basilar length, skull narrow across rostrum, zygomata and mastoids; nasals short and posteriorly truncate; premaxillae extending behind nasals; temporal lines faint and divergent posteriorly.

Comparisons.—From Thomomys talpoides rostralis (North Platte River Valley, SW of Saratoga, Wyoming), the subspecies to the east and south, T. t. meritus differs in: Lesser size, darker color, smaller and slenderer skull. The slenderness is especially noticeable in the breadth across the zygomata, mastoids, and rostrum. From Thomomys talpoides clusius (topotypes), the subspecies to the north and west, T. t. meritus differs in: Color much darker; rostrum longer; skull narrower across mastoids and zygomata; tympanic, and also mastoid, bullae smaller. Resemblance to T. t. clusius is shown in the narrowness of the skull interorbitally and in the shortness of the tooth-row.

Remarks.—The specimens of Thomomys from Wyoming on which the name T. t. meritus is based were obtained by Mr. E. Lendell Cockrum and his associates with the thought that intergradation might be shown between T. t. rostralis to the east and T. t. clusius to the west. The animals showed instead, that there was a subspecies differing from each of the two mentioned subspecies in small size, dark color and slenderness of skull. Acknowledgment of assistance [Pg 222] with field work is made to the Kansas University Endowment Association.

Measurements.—Average and extreme measurements of seven adult males and five adult females, from the type locality, are as follows: Total length, ♂ 204 (193-226), ♀ 207 (193-210); length of tail, 56 (46-68), 56 (50-63); length of hind foot, 27.6 (26-30), 27.4 (27-28); basilar length, 30.7 (29.0-33.0), 30.1 (29.5-30.7); zygomatic breadth, 20.4 (18.9-21.6), 19.5 (18.8-20.0); least interorbital breadth, 6.2 (5.8-6.6), 6.1 (5.9-6.3); mastoidal breadth, 17.9 (16.9-18.5), 17.2 (16.7-17.6); length of nasals, 13.7 (12.4-14.7), 13.2 (12.8-13.9); breadth of rostrum, 7.0 (6.5-7.5), 6.9 (6.7-7.3); length of rostrum, 16.3 (15.3-17.5), 15.8 (15.3-16.1); alveolar length of maxillary tooth-row, 7.1 (6.9-7.3), 7.1 (6.8-7.5).

Specimens examined.—Total number 26 and unless otherwise indicated in the Museum of Natural History of the University of Kansas.

Wyoming.—Carbon County: Savery (8 mi. N and 19-½ mi. E, 8800 ft., 12; 7 mi. N and 17 mi. E, 8300 ft., 1; 6 mi. N and 12-½ mi. E, 8400 ft., 1; 6 mi. N and 13-½ mi. E, 8400 ft., 2; 6 mi. N and 14-½ mi. E, 8350 ft., 1; 5 mi. N and 3 mi. E, 6800 ft., 1; 4 mi. N and 8 mi. E, 7800 ft., 7300 ft., 3; 4 mi. N and 10 mi. E, 7800 ft., 3) 24.

Colorado—Routt Co. ?: Elkhead Mts., 20 mi. SE Slater, 2 (U. S. B. S.).

Museum of Natural History, University of Kansas, Lawrence. Transmitted October 20, 1951.

24-1359 275q21

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The Project Gutenberg eBook of A New Pocket Gopher (Genus Thomomys) From Wyoming and Colorado 2q623w

A New Pocket Gopher (Genus Thomomys) From Wyoming and Colorado 5r6f4y

BY 595xz

E. RAYMOND HALL 3g253i

University of Kansas Publications Museum of Natural History 1e4l37

Volume 5, No. 13, pp. 219-222 December 15, 1951 2nl6o

University of Kansas LAWRENCE 1951 36f5z

University of Kansas Publications, Museum of Natural History Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Edward H. Taylor, Robert W. Wilson Volume 5, No. 13, pp. 219-222 December 15, 1951University of Kansas Lawrence, Kansas 3b6v2e

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1951 24-1359 6yne

A New Pocket Gopher (Genus Thomomys) from Wyoming and Colorado 2b4o5u

By 211hd

E. RAYMOND HALL 3g253i

24-1359 275q21

THE FULL PROJECT GUTENBERG LICENSE 633mi