Descriptions of East Asiatic Mammals 233 
bright russet. The cheeks and sides of the nose are tan. The head 
and body measure 8 inches, the tail 5% inches, the foot 1% 
inches. 
The Sunda Islands Long-nosed Tree Squirrels, genus 
Rhinosciurus, and the Continental Long-nosed Squirrels, 
Dremomys, are regarded by Zahn as related subgenera. Pocock 
associates them with Lariscus. Ellerman places Rhinosciurus 
and Lariscus with Menetes in his "Lariscus section" but 
acknowledges this to be an "unnatural" group. 
The Sunda Islands Long-nosed Squirrels, Rhinosciurus, 
have the rostrum greatly drawn out so as to give the head the 
form of a large Rat's head. The tail is quite short. The typical 
species, R. laticaudatus of Borneo, is represented by R. I. 
tupaioides (meaning "like a tree-shrew") on the southern half 
of the Malay Peninsula. This mainland race is colored dull red- 
dish brown above, buffy on the flanks, and whitish beneath. 
The tail is gray with its hairs white-tipped. The length of the 
head and body is about 8 inches, of the tail about 3% inches, 
of the hind foot 1% inches, 
David's Rock Squirrels, genus Sciurotamias, have the tail 
only slightly shorter than the head and body, small cheek 
pouches, the snout somewhat lengthened, the soles of the feet 
densely hair-clad from the heels to the rounded pads at the bases 
of the toes. The females have 3 pairs of nipples. The single 
species, S. davidianus, is colored gray, the result of an even 
mixture of black and pale buffy reddish, the limbs and tail much 
the same. A pale buff ring surrounds the eye. The untufted 
ears are somewhat blackish. The underparts are white, tinted 
with buff. The length of the head and body is from 8 to 9 
inches, of the tail 8 inches, hind foot 2 to 2% inches. 
This Rock Squirrel is found through Hopei and Shantung, 
and extends west to Kansu. In Honan, Shensi, and Hupeh it is 
represented by the brown-backed race S. d. saltitans; in Szech- 
wan by the black- footed S. d. consobrinus. This species, though 
