138 TAMIAS. 



Measurements. Average total length, 285; tail vertebrae, 117, 

 hind foot, 34. Skull: occipito-nasal length, 41; Hensel, 31; zygo- 

 matic width, 21; interorbital width, 9; palatal length, 16; length of 

 upper molar series, 5.5. 



102. quadrivittatus (Sciurus), Say, Long's Exped. Rocky Mts., n. 

 1823, p. 45- 



quadrivittatus (Tamias}, Elliot, Syn. N. Am. I^Iamm., 1901, p. 75. 

 COLORADO CHIPMUNK. 



Type locality. Arkansas River, Colorado, "near where it breaks 

 through the foothills," Park County (?) 



Gcogr. 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. 



Measurements. Average total length, 223; tail vertebras, 82; 

 hind foot, 31. Skull: occipito-nasal length, 35; Hensel, 14; zygo- 

 matic width, 18; interorbital width, 7; palatal length, 15; length of 

 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 vpth 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 



