1 54 The Mammals of Colorado 
Habits, — Similar to those of C. ludovicianus, but appar- 
ently hibernating more completely. 
FIG. 52. WHITE-TAILED PRAIRIE DOG, Cynomys leUCUTUS 
Half grown young. From life, E. R. Warren, Photo. 
Cynomys leucurus (Grk. leukos, white, + urus, tail). 
White-tailed Prairie Dog. 
Cynomys leucurus Merriam, N. A. Fauna, No. 4, p. 33 (1890). 
Vernon Bailey. 
Type locality. — Fort Bridger, Uinta County, Wyoming. 
Measurements. — Total length, 13. 2 5 ;tail vert., 2.15 ;hind foot, 2.25. 
Description. — (From specimen taken in Routt Co., near Snake 
River, June 19th) : Similar in color above to gunnisonihut paler, and 
hardly as much black intermixed; a prominent black mark over 
eye, and a blackish patch on cheek below eye; chin whitish; sides, 
tops of feet, and underparts pale fulvous; base of tail like back; 
outer two thirds white with a few black hairs, under surface of tail 
similar but white with no black hairs, and rather yellowish. While 
about the same length as gunnisoni the present species seems to be 
a rather bulky, heavier animal. The black markings above and 
below eye are very distinctive characters. 
Distribution. — This is the Prairie Dog of northwestern Colorado 
and of North Park, in Larimer County. Besides the above named 
county it is found in Routt, Rio Blanco, Eagle, Mesa, Delta, eastern 
Montrose, Ouray, and possibly extreme western Gunnison counties. 
