Descriptions of East Asiatic Mammals 223 
ridgei from the upper Chindwin, mottled gray as in sladeni, but 
with the face gray and the hands and feet straw-color; C. s. 
fryanus, with face, hands, and feet buffy white; C. s. careyi, 
with body color generally light straw-brown and hands and feet 
whitish. Callosciurus sladeni haringtoni from the Chindwin 
Valley has the upperparts cream-buff, the underparts also buffy. 
A distinct black line along the side separates the upper from the 
under color. The elbows, knees, fingers, and toes are blackish; 
C. s. solutus, also from that valley, lacks the black lateral stripes ; 
C. s. millardi is dark yellowish gray with the face, hands, and 
feet white, the fingers, toes, elbows, and knees blackish, and the 
tail straw-colored ; C. s. rubex is strongly reddish along the mid- 
dle of the back, head and face, hands and feet. The sides are 
russet-brindled and the tail a mixture of red and black. C. s. 
vernayi, originally from Tapa Hka (26° 9' N., 96° 16' E.), is 
less ferruginous than rubex, but olive-gray with a brown wash, 
and the tail is colored throughout like the body; the under- 
parts are reddish. All these forms of sladeni come from 
Burma. 
The Russet Tree Squirrels, Callosciurus ferruginous, are 
colored reddish brown above, the underparts orange-red; the 
tail at the base is like the back but the distal half is orange 
rufous. The length of the head and body is from 8 to 9% 
inches, tail from 6% to 8 inches, the foot about 2 inches. The 
typical Russet Tree Squirrel is from Pegu, lower Burma. Its 
several races include C. f. williamsoni from Mekong River, 
Laos ; C. f. herberti from southeastern Siam ; C. f. phanrangis 
from southern Annam; C. f. splendens and C. f. cinnamoneus 
from Cambodia ; C. f. primus from Mt. Souket, northern Siam ; 
C. f. menamicus from northern Siam; C. f. annellatus from 
Angkor, Cambodia, and Laos west of the Mekong ; C. /. splen- 
dens, also from Cambodia. 
Osgood points out that in williamsoni, the nearest relative of 
which is menamicus, the underparts, at least in some pelages 
(seasonal?), are darker than the upperparts. 
