Descriptions of East Asiatic Mammals 219 
except the feet, which are white or buff instead of blackish. 
The length of the head and body is 13V2 inches, of the tail 15 
inches, hind foot 3 inches. 
The Oriental Tree Squirrels, including the Forest, Pre- 
vost's, Red-bellied, Malay, Black-striped, White, Plantain, and 
Lesser Tree Squirrels, genus Callosciurus, are an enormous 
group of Squirrels of southeastern Asia and the East Indies, 
which show extraordinary divergence in color pattern and rep- 
resent, according to Ellerman, some twelve distinct species 
groups, of which two, Tamiops and Tomeutes, are separately 
treated in this book. The extreme variability in color between 
one race and the next has been pointed out by Carter and 
others. In the Chindwin Valley alone the former records three 
distinct races of Callosciurus on the west bank and eight races 
on the east. 
The Oriental Tree Squirrels, with the exception of the Lesser 
Tree Squirrels and Lowe's Tree Squirrels, are of moderate 
size. They have untufted ears and extremely complex male sex- 
ual organs. Blanford states that many species have 2 pairs of 
nipples, 1 pectoral, 1 inguinal, but Allen writes that the two 
pairs are abdominal. Few young are born. The northern limit 
of the genus is about lat. N. 32° in China (C. erythraus) or as 
far north as Hopei if Tamiops is included. 
The type species of Callosciurus is Prevost's Squirrel of the 
Malay Peninsula. 
The Prevost's Tree Squirrels, Callosciurus prevosti, those 
ornate Squirrels of Malacca that induced Gray to propose the 
name Callosciurus (meaning "beautiful squirrel"), are believed 
by Ellerman to consist of only a single species, although in that 
species he places no less than thirty-eight races, almost all of 
which are island forms. Prevost's Squirrel is essentially black 
above, deep chestnut below, with a broad white stripe along the 
sides from the cheeks to the thighs. A short, rather variable 
black stripe runs between the shoulders and thighs immediately 
