Mountain Pocket Gopher 83 
County, May 23d) : Color, above a dark reddish brown, almost 
chestnut; brightest on sides; nose and sides of mouth blackish ; chin 
white ; feet grayish white ; under parts buffy ochraceous ; tail blackish, 
often with whitish tip. This species is the darkest of the Colorado 
Pocket Gophers, though somewhat variable in color. Sometimes 
it inclines strongly toward chocolate. Several specimens in the 
Warren collection show white hairs scattered here and there on 
the upper parts; in some cases enough to make irregular spots. 
Skins from different localities show this. It does not seem to be 
a phase of albinism, as several partial albinos of other species 
in the same collection show the white in distinct patches and 
blotches. 
The skull is somewhat larger than that of T. clusius, with some- 
what wider spreading zygomata, and less interorbital constriction ; 
bullae a trifle larger than in T. clusius; nasals do not extend as far 
back as the maxillae. 
Distribution. — The Mountain Pocket Gopher has thus far only 
been found in Colorado, where it is recorded from La Plata, Gunni- 
son, Garfield, Rio Blanco, Routt, Larimer, Eagle, Chaffee, Saguache, 
FIG. 30. MOUNTAIN POCKET GOPHER, ThoMomyS foSSOr 
E. R. Warren, Photo. 
Huerfano, Custer, El Paso, and Teller counties. It keeps to the higher 
elevations as a rule, and no doubt is found in all our mountain 
countries. It sometimes ranges as low as about 6,000 feet but 
