162 
YELLOW-BELLIED MARMOT. 
on the hack arc yellowish-white and black, in place of rusty brown, black, 
and white. 
The head is narrower, the toes smaller, and the claws only half as long, 
as in the above specimens. The ears are also considerably smaller, 
narrower and more ovate than the ears of A. mcmax, which are round. 
