CITELLUS. 
Fia, 25. 
CITELLUS (XEROSPERMOPHILUS) S. MICROSPILOTUS, 
No, 708 Field Columbian Mus, Coll, 
Nat, size, 
Uprrer Toorkn ROW, 
LOWER TOOTH ROW, 
enlarged 4 times Enlarged 4 times, 
106. tereticaudus (Spermoplulus), Baird, N. Am. Mamm., 1857, p. 
315. Elliot, Syn. N. Am. Mamm., rgor, p. 98. 
ROUND-TAILED SPERMOPHILE, 
lype 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 lke back, brown at end, tip vellowish. 
Measurements. Total length, 248; tail vertebra, 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, 
dt. SONROTLCNSTS (Spermophalus), Ward, Amer. Nat., Puan. Vx ISO!l, p. 
ISS. 
SONORAN SPERMOPHILE, 
l'ype locality. Hermosillo, State of Sonora, Mexico. 
Geogr. Distr. State of Sonora, range unknown, 
Genl. Char. Similar to C. eryptosptlotus: 
.) 
UC Olor, 
body without spots. 
Upper parts fawn color, hairs ringed with black, straw 
vellow, and walnut brown, and tipped with cream buff; sides paler 
