144 



CITELLUS. 



FIG. 25. CITELLUS I.XEROSPERMOPHILUS) s. MICROSPILOTUS. 



No. 703 Field Columbian Mus. Coll. Nat. size. 



UPPER TOOTH ROW. LOWER TOOTH ROW. 



Enlarged 4 times. Enlarged 4 times. 



106. tereticaudus (Spennophilus), Baird, N. Am. Mamm., 1857, p. 



315. Elliot, Syn. N. Am. Mamm., 1901, p. 98. 

 ROUND-TAILED SPERMOPHILE. 



Type locality. Old Fort Yuma, San Diego County, California. 



Geogr. Distr. Central California to Lower California, Arizona, 

 and State of Sonora, Mexico. 



Genl. Char. Tail as long as four-fifths head and body; no spots 

 on body ; feet broad, soles hairy. 



Color. Above grizzled gray and yellowish brown ; beneath brown- 

 ish white; tail like back, brown at end, tip yellowish. 



Measurements. Total length, 248; tail vertebrae, 112; hind foot, 

 35. Skull: occipito-nasal length, 37; Hensel, 29; zygomatic width, 

 23; interorbital width, 9; palatal length, 17; length of upper molar 

 series, 7. 







a. sonoriensis (Spermophilus}, Ward, Amer. Nat., xxv, 1891, p. 



158. 

 SONORAN SPERMOPHILE. 



Type locality. Hermosillo, State of Sonora, Mexico. 



Geogr. Distr. State of Sonora, range unknown. 



Genl. Char. Similar to C. cryptospilotus: body without spots. 



Color. Upper parts fawn color, hairs ringed with black, straw 

 yellow, and walnut brown, and tipped with cream buff; sides paler 



