SCIURUS. 111 
Fig. 17. SciURUS (PARASCIURUS) RUFIVENTER TEXENSIS. 
No. 4739 Field Columbian Mus. Coll. Nat, size. 
rusty ; tail above similar to back but more yellowish, beneath uniform 
cinnamon, darker than belly. The color of ventral surface varies 
from pure white to deep orange among individuals. 
Measurements. Total length, 532; tail to end of hairs, 280; hind 
foot, 64.5. Skull: average of two; basal length, 50; palatal length, 
25.5; interorbital width, 18; zygomatic width, 33.5; length of upper 
molar series, 10.5. 
F, Otosciurus, Nelson. 
Premolars, —. Skull short and very broad, with curved superior 
outline; rostrum father short, compressed; nasals narrow posteriorly 
and extending beyond premaxille; molars heavy. 
