142 CITELLUS. 
Geogr. Distr. Northeastern part of State of Sonora, Mexico, 
to southern Utah and Nevada, into California. 
Genl. Char. Ears small, tail short, black dorsal stripe wanting; 
angle of mandibular ramus much developed. 
Color. Above grizzled grayish brown, tinged with vinaceous 
posteriorly; narrow white stripe on sides; flanks tinged with pale 
chestnut; orbital ring, and lower parts of body yellowish white; 
tail flat, above black and white, edged with white, beneath white 
bordered with black and edged with white. Some specimens exhibit 
little or no difference between the upper and lower sides of the tail. 
Measurements. Total length, 260; tail vertebra, 88; hind foot, 
41. Skull: occipito-nasal length, 39.5; Hensel, 32; zygomatic width, 
23; interorbital width, 10; palatal length, 19; length of upper molar 
series, 8. 
a.—saxicola (Spermophilus), Mearns, Proc. U. S. Nat. Mus., 1896, 
p. 444. Elliot, Syn. N. Am. Mamm., 1gor1, p. 86. 
Rock SPERMOPHILE. 
Type locality. Tinajas Atlas, Gila Mountains, Yuma County, 
Arizona. 
Geogr. Distr. State of Sonora, Mexico, north to Gila Mountains, 
southwestern Arizona. 
Genl. Char. Colors pallid; tail rather long. 
Color. Like C. harrist, but all hues much paler, and tail longer. 
Above grayish brown, all the hairs tipped with yellowish white 
giving a grizzled appearance; a narrow whitish stripe on side from 
shoulder to rump; flanks speckled with brown and rufous; shoulders 
and limbs pale chestnut, hair tipped with whitish; under parts white; 
tail black mixed with white and a narrow edging of the same; hands 
and feet white tinged with buff. . 
Measurements. Total length, 245; tail vertebrz, 93; hind foot, 
40. (ex Type.) Skull: occipito-nasal length, 40; Hensel, 35; zygo- 
matic width, 23.5; interorbital width, 10; palatal length, 20; length 
of upper molar series, 8. 
104. leucurus (TJamias), Merr., N. Am. Faun., No. 2, 1889, p. 20. 
leucurus (Spermophilus), Elliot, Syn. N. Am. Mamm., 1901, p. 
86. 
WHITE-TAILED SPERMOPHILE. 
Type locality. San Gorgonio Pass, Riverside County, California. 
Geogr. Distr. Lower California, Mexico, to California, Utah, 
Arizona, and New Mexico. 
Genl. Char. Smaller than C. harrist, tail shorter, below white. 
