250 Mammals of Eastern Asia 
to Belomys pearsoni, the Tufted Flying Squirrel. The length of 
the head and body is 7 1 / 4 inches, tail 5 inches, hind foot 1% 
inches. 
A new subgenus of Pteromys, Olisthomys Carter, contain- 
ing the species morrisi Carter from Dalu (Taro, 26° 21' N., 
96° IT E), northern Burma, is stated to be related to Hylopetes 
but to have the low, spreading audital capsules of Petinomys and 
to have unsculptured teeth. The tips of the body hairs are 
reddish buff, the bases blackish ; the underparts and cheeks are 
white. The tail is blackish above, paler beneath, the feet blackish. 
The length of the head and body is 5% inches, tail 5 inches, hind 
foot 1 inch. 
The Lesser Flying Squirrels, Petinomys, are much like 
Hylopetes externally and are perhaps quite as closely related to 
Pteromys. But in place of the full, rounded audital capsules of 
Hylopetes, those of Petinomys are low and flat. The number of 
nipples is from 4 to 6 (Thomas). The type species is P. lug ens 
from Sipora Island, near Sumatra. 
Four groups of Petinomys are recognized by Ellerman, two 
of which, the setosns and genibarbis groups, occur on con- 
tinental Asia. The typical group is restricted to Sumatra and 
the Philippines, and the fourth, the fuscocapillus group, is found 
in southern India and Ceylon. 
Phipson's Lesser Flying Squirrel, Petinomys phipsoni, has 
the usual cinnamon color of the small Flying Squirrels and the 
usual deep gray bases showing when the fur is ruffled. The 
undersurface is creamy. The ears are very small, with tufts of 
black hairs growing from their bases in front and behind. The 
tail, smoky buff, becoming darker toward the tip, is, as usual, 
distichous (like a feather). The length of the head and body 
is 5 inches, tail 4% inches, foot 1 inch. This animal is from 
Tenasserim. According to Ellerman, it is a member of the same 
group as the tiny Sumatran species, P. setosus. 
