Descriptions of East Asiatic Mammals 235 
north-central Siberia, and east beyond the base of the Kam- 
chatka Peninsula. Northward this form extends well beyond the 
Arctic Circle, according to a map by Ognev. Eutamias s. ut hen- 
sis is from the Uda River, eastern Siberia, E. s. orientalis from 
Ussuri and Korea, E. s. lineatas from northern Japan, Sakhalin, 
and the mainland from lat. N. 45° to Gichiga, at the northwest 
Fig. 53. Asiatic Chipmunk, 
Eutamias sibiricus. 
corner of the Sea of Okhotsk, and E. s. senescens from Hopei, 
China. 
The length of the head and body in senescens is from 6 to 
6% inches, of the tail 4 to 5 inches, of the hind foot about 
1% inches. The race senescens has the rump washed with red- 
dish ; the northern forms are grayer. 
The Ground Squirrels and Susliks, genus Citellus, com- 
prise a large assemblage of forms, and are found under a num- 
ber of subgenera in both hemispheres. The Ground Squirrels 
are strictly ground-dwellers, making burrows in loose soil. They 
favor plains areas with arid climates, and they hibernate. Their 
ears are very short and low, the claws powerfully developed for 
digging, and the tail is short, from one-half to one-fifth the 
