Antelope Squirrel 
165 
Measurements. — Totallength, 8.50 ;tail vert., 2.50 ;hind foot, 1.60. 
Description. — (From specimen taken at Grand Junction, Oct. 
3d): Back grizzled, black, white, and rufous; top of head rufous, 
very little black intermixed; a distinct white stripe on either side 
of back, about one eighth of an inch wide, extending from shoulder 
to hip; shoulders, sides of body below stripe and flanks, and 
upper surfaces of feet, a light rufous or cinnamon color ; light ring 
about eye ; under surface of body white; upper surface of tail black, 
white edged, under surface white, mixed black and white border 
and tip. 
An April-caught specimen from Montezuma County has the 
hair longer and silkier, but colors are exactly the same. The general 
tone of the coloration of the animal is cinnamon. 
Distribution. — This species is found in northern Arizona, southern 
Utah, southwestern Colorado, and northeastern New Mexico. 
An inhabitant of the Lower Sonoran and lower portions of the 
Upper Sonoran Zones, it is found in the less elevated districts of 
southwestern Colorado, from Grand Junction up the Gunnison to 
Hotchkiss, and presumably it is also found up the Grand River 
some distance. It has been met with near Montrose, near Coventry, 
Montrose County, 6,800 feet, and at Bedrock, in the same county; 
also in western Montezuma County. 
Habits. — The Antelope Squirrel is found about rocky 
places to a certain extent, at least; also amongst the sagebrush 
and greasewood. Its food and habits are similar to those 
of the other ground squirrels. As the animal runs it elevates 
its tail over the back, showing the white under surface and 
giving the appearance of a white rump like an antelope's, 
whence the common name, "Antelope Squirrel," by which 
it seems to be almost universally known throughout its range. 
It has as many as eight young in a litter. 
Genus CALLOSPERMOPHILUS (Grk. kallos, beautiful + 
s pernio philus) . 
C alios permophilus Merriam, Proc. Biol. Soc. Wash., xi., p. 189 
(1897). Type C. lateralis. 
Ears fairly large ; tail less than one half length of head and body; 
skull broad; interorbital space broad; nasals broad, longer than 
premaxillaries; dentition as in Citellus; first premolar small. 
This genus of Ground Squirrels, somewhat closely resem- 
