CITELLUS. 147 
24; interorbital width, 9; palatal length, 19; length of upper molar 
series, 7. 
C. * Callospermophilus. 
Skull broad; interorbital space broad; rostrum broad, nasals 
longer than premaxille; first premolar smaller than second. Tail 
less than half the length of head and body. 
Fic. 26. CiTELLUS (CALLOSPERMOPHILUS) MADRENSIS. 
U.S. Nat. Mus. Coll Nat. size 
UPPER TOOTH ROW LOWER TOOTH ROW 
Enlarged § times Enlarged § times 
110. madrensis (Callospermophitlus), Merr., Proc. Wash. Acad. 
SCIEN., III, I90r, 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 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. 
