CITELLUS. 147 
24; interorbital width, 9; palatal length, 19; length of upper molar 
series, 7. 
0. * Callospermophilus, 
Skull broad; interorbital space broad; rostrum broad, nasals 
longer than premaxilla; first premolar smaller than second. Tail 
less than half the length of head and body. 
Hy . 
re 
Fig. 26. CITELLUS (CALLOSPERMOPHILUS) MADRENSIS. 
U.S. Nat. Mus, Coll. Nat. size, 
UPPER TOOTH ROW, LOWER TOOTH ROW 
Enlarged s times, Enlarged § times, 
110. madrensis (Callospermophilus), Merr., Proc. Wash. Acad. 
Seien., III, 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 
fulvous; light lateral stripe grizzled buffy gray, black stripes faint, 
nearly obsolete; under parts whitish; tail above grizzled grayish 
fulvous and blaek, 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. 
