SCIURUS. 113 
with black border and subapical bar and white edging; hands white 
or whitish; feet grizzled gray. 
Measurements. Total length, 500; tail vertebra, 247; hind foot, 
70. Skull: average of five; basal length, 50.1; palatal length, 27.3; 
interorbital width, 19.8; zygomatic width, 35.1; length of upper 
molar series, II.2. 
G. Echinosciurus. 
2—2 
Premolars, ; Skull: broad, depressed between orbits; superior 
outline curved, sharpest decline posteriorly; occipital region widest; 
interorbital constriction very slight; rostrum broad and short; outer 
side of nasals reaching ends of premaxilla; the nasals shorter than 
width between orbits; basioccipital and basisphenoid broad, widely 
separating audital bull. 
Fic. 19. SciuRUS (ECHINOSCIURUS) AUREIGASTER. 
No. 4744 Field Columbian Mus, Coll. Nat. size. 
