164 
The Mammals of Colorado 
Measurements. — Total length, 17-19 ; tail vert., 7.1-8.25 ; bind foot, 
2-35- 
Description. — Colorado specimens in the Warren Collection seem 
to have the rufous somewhat darker and more intense, otherwise 
there is but little difference to be seen between this form and C. v. 
grammurns. The tail seems to average somewhat longer in propor- 
tion. I am doubtful as to these specimens being after all really 
referable to utah, as they are not so very different from the series 
of grammurus in the same collection, and there is considerable 
individual variation. 
Distribution. — Western Colorado, from 8,000 feet down. Known 
as far east as Glenwood Springs and a short distance up the 
Canon of the Grand above that place ; also taken in Montezuma, 
San Miguel, Montrose, Mesa counties. Seen in Delta and Garfield 
counties. Outside of Colorado it has been recorded from Utah 
only. 
Habits. — The habits have been sufficiently described under 
the preceding species. 
Genus AMMOSPERMOPHILUS (Grk. ammos, sand, + sperma, 
seed, + philein, to love. Sand Sperm ophile.) 
Ammos permophilus Merriam, Proc. Biol. Soc. Wash., vii., p. 27 
(1893). Type A. leucurus. 
Small spermophiles or ground squirrels having small ears, 
and with the tail less than one half the length of head and body. 
Skull very broad ; interorbital constriction slight ; nasals short, 
equal in length to the premaxillaries ; rostrum short; dentition as in 
Citellus; first premolar less than half the size of second. 
This genus of desert-loving spermophiles is found in the 
southwestern portions of the United States, from western 
Colorado to California and southward into Sonora, Mexico, 
and Lower California. Elliot's Check-list gives eight 
species and subspecies, one of which is found in Colorado. 
Ammospermophilus leucurus cinnamomeus. White- 
tailed Spermophile. Antelope Squirrel. 
Tamias leucurus cinnamomeus Merriam, A^. Am. Fauna, No. 3, 
p. 52 (1890). 
Type locality. — Echo Cliffs, Painted Desert, Coconino County, 
Arizona. (Merriam and Bailey.) 
