Descriptions of East Asiatic Mammals 227 
guished from the previous one by its gray instead of red tinder- 
parts. The length of the head and body is about 8 inches, of the 
tail 7% inches, of the foot 1% inches. 
The Bushy-tailed Tree Squirrels, Callosciurus hippurus, 
are essentially a Sunda Islands group. Only one form, the typi- 
cal race, C. h. hippurus, is found in the lower part of the Malay 
Peninsula, extending from around Malacca, as far north as 
Trang, peninsular Siam. The group is well represented, also, in 
the Philippines. The color of the back, sides, top of neck, and 
tail is a grizzle of black and tawny yellow. The top and sides of 
the head and the outer sides of the limbs are grizzled black and 
white. The feet are blackish, the underparts pale brown. The 
tail is black, slightly grizzled at the base. The length of the head 
and body is about 11 inches, of the tail 10 inches, hind foot 2% 
inches. 
The Lesser Tree Squirrels, Callosciurus tenuis, are unus- 
ually small compared with most members of the genus, and the 
tail is narrower and more thinly haired. The hind foot is less 
than 1% inches long. The typical species is from Singapore. The 
back and limbs are colored grayish brown, with a yellow mark 
on the outside of the thigh. There is a trace of reddish on the 
sides. The underparts are pale yellowish gray. The tips of the 
hairs of the tail are yellowish. 
Three races of tenuis are recognized on the mainland : the race 
C. t. tahan is found in Pahang, C. t. gunong in Bandon, penin- 
sular Siam, and C. t. surdus in Trang, peninsular Siam. Three 
other species are found on the Sunda Islands. 
Lowe's Tree Squirrels, Callosciurus lowei, small-sized like 
tenuis, with the length of the foot less than l x /2 inches, are 
found chiefly on Sumatra and Borneo. The typical race comes 
from Borneo. On the mainland two forms are known, C. I. rob- 
insoni from Patani and C. /. alacris from the Selangor-Pahang 
boundary, both in the Malay States. 
The former, the larger of the two, is grizzled black and red, 
