138 TAMIAS. 
Measurements, Average total length, 285; tail vertebra, 117, 
hind foot, 34. Skull: occipito-nasal length, 41; Hensel, 31; zygo- 
matic width, 21; interorbital width, g; palatal length, 16; length of 
upper molar series, 5.5. 
102. quadrivittatus (Sciurus), Say, Long’s Exped. Rocky Mts., 1, 
1823, p. 45. 
quadrivittatus (Tamias), Elliot, Syn. N. Am. Mamm., 1gor, p. 75. 
COLORADO CHIPMUNK. 
Type locality, Arkansas River, Colorado, ‘‘near where it breaks 
through the foothills,’ Park County (?) 
Geogr. Distr. State of Durango, Mexico, north to southern 
boundary of Colorado, northward through Wyoming to and includ- 
ing the Yellowstone National Park. 
Genl. Char. Rather small; general color gray. 
Color. Breeding Pelage. Above gray, sides washed with pale 
yellowish brown; beneath grayish white; dark dorsal stripes black 
and rufous; light ones ashy; outer white. 
Post-breeding Pelage. Above rufous; thighs plumbeous gray; 
dark dorsal stripes black and rufous; outer light stripes whitish; 
flanks yellowish rufous; under parts grayish white; dark facial stripes 
rusty brown; light ones grayish white; tail above black and buff, 
beneath buffy ochraceous bordered and fringed with black. 
3; tail vertebre, 82; 
hind foot, 31. Skull: occipito-nasal length, 35; Hensel, 14; zygo- 
matic width, 18; interorbital width, 7; palatal length, 15; length of 
Measurements. Average total length, 22 
upper molar series, 4. 
The genus CITELLUS, containing the Spermophiles, is represented 
in North America by a considerable number of species and varieties, 
which exhibit the extremes of form from that of a rather small, stout, 
short-tailed animal, to a large, more slenderly and gracefully shaped 
creature with a long, bushy, squirrel-like tail. In many places they 
are known as ‘gophers,’ and like the real gopher, they are great 
diggers, and live in burrows, into which they scurry at the least 
alarm. They are gregarious and sociable, living in communities, 
and in certain districts of our country are veritable pests when making 
their abodes in cultivated ground. Very active and industrious, 
they lay up great stores of food against the winter, and in spite of 
their troublesome propensities, are pleasing objects in a landscape, 
as they flit over the ground waving their bushy tails, or sit upright 
