Descriptions of East Asiatic Mammals 251 
The Bearded Lesser Flying Squirrels, Petinomys geni- 
barbis of Java, are represented on the Malay mainland by P. g. 
malaccanus, colored chestnut dorsally, the bases of the hairs 
slate. The head and fore quarters are grayish brown, the under- 
surface buffy, the tail dark brown above and somewhat reddish 
beneath. The length of the tail is 3% inches, foot 1% inches. 
The Hainan Lesser Flying Squirrel, Petinomys electilis, 
also a member of the genibarbis group, has the hairs cinnamon- 
tipped and fuscous-based; they are gray-tipped on the mem- 
brane, which appears blackish brown edged with white. The 
hind feet and toes are partly white. The lips are white; this 
color is projected behind the ear as a whitish streak. The under- 
pays are pure white to the bases of the hairs, with a wash of 
cinnamon along the sides. The distichous tail is brown, becom- 
ing black at the tip. The length of head and body is 6% inches, 
tail 6Ys inches, foot 1% inches. 
The Pigmy Flying Squirrels, genus Petaurillus, are typi- 
cally fawn-colored, with the hair bases dark gray. In the type, 
P. hosei of Borneo, there is a white spot behind the base of 
each long, narrow ear. The undersurface is dull white. The tip 
of the gray-brown tail is white. The teeth are uncomplicated, 
the ear capsules large. There are 4 nipples (Thomas). Two 
young are born. The length of the head and body in the Bornean 
type species is only 3% inches, the tail almost 4 inches, the 
foot % inch. 
The Selangor Pigmy Flying Squirrel, Petaurillus kinlochi, 
like P. hosei has a white spot behind the base of each ear and the 
tip of the tail is white. The length of head and body is 3% 
inches, tail 3% inches, hind foot % inch. 
Horsfield's Flying Squirrel, Iomys horsfieldi, continental 
race davisoni, is a rusty brown Flying Squirrel with the blackish 
hair bases showing through; the flying membrane is bright 
russet. The markedly distichous tail is brown above, bright 
chestnut beneath. The underparts are pale orange. The ears are 
