636 THE AMERICAN NATURALIST. (VoL. XXXV. 
rump ; rump hairs elongate, black with white tips ; under parts 
soiled white, the hairs annulated with drab ; feet and hands 
brownish-black. 
The type and No. 8447 are in fresh pelage and are similar. 
No. 8445, adult 2, is rather darker and more nearly approaches 
D. colombiana in color. The three other specimens, of which 
A 
B. 
A. Dasyfrocta isthmica from Divala, Chiriqui, adult 9. 
B. Type of Dasyprocta callida, adult á. 
two are nursing females, are in worn, shabby pelage, in which 
the black of the rump has faded to dull brown and the w white 
tips of the hairs are worn down and discolored. In No. 8446 
new, normally colored rump hairs are growing in again among 
the old faded ones. 
