CITELLUS. 147 



24; interorbital width, 9; palatal length, 19; length of upper molar 

 series, 7. 



0. * Oallospermophilus. 



Skull broad; interorbital space broad; rostrum broad, nasals 

 longer than premaxillae; first premolar smaller than second. Tail 

 less than half the length of head and body. 



FIG. 26. CITELLUS (CALLOSPERMOPHILUS) MADRENSIS. 



U. S. Nat. Mus. Coll. Nat. size. 



UPPER TOOTH ROW. LOWER TOOTH ROW 



Enlarged 5 times. Enlarged 5 times. 



110. madrensis (Callospcrmophilus), Merr., Proc. Wash. Acad. 



Scien., in, 1901, p. 563. 

 SIERRA MADRE SPERMOPHILE. 



Type locality. Sierra Madre, near Guadalupe y Calvo, State of 

 Chihuahua, Mexico. 



Genl. Char. "Similar to C. lateralis, but tail about half as long; 

 rostrum less swollen. " 



Color. Fall Pelage. Above grizzled grayish; rump dull grayish 

 tulvous; light lateral stripe grizzled buffy gray, black stripes faint, 

 nearly obsolete; under parts whitish; tail above grizzled grayish 

 fulvous and black, beneath yellowish, the plumbeous base of hairs 

 showing through; hands and feet whitish. 



*Some writers accord this subgenus, generic rank. It does not seem to 

 possess sufficient claims for this distinction. 



