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\ieveloped. 



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 vertebrae, 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., 1901, 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. harrisi, 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 vertebras, 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 (Tamias), 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. harrisi, tail shorter, below white. 



