Descriptions of East Asiatic Mammals 127 
patch behind each ear, but the rest of the body and the limbs 
black. 
The Mitred or Sureli Leaf Monkeys, genus Presbytis, with 
type species P. aygida of Java, are morphologically separable 
from the Monkeys of the genus Trachypithecus only by average 
characters of the skull. They agree with one another in the 
color pattern of the young — white, with a blackish cross-shaped 
pattern running from the back of the head to the end of the tail 
and to the elbows or beyond; or rarely the young are entirely 
white. The young are never orange-brown like the young of 
Trachypithecus. 
The genus comprises mostly island species, including the Gray 
Leaf Monkey, P. ay gala. But one species, P. femoralis, the 
Banded Leaf Monkey of Singapore, is present on the Malay 
Peninsula and extends north as P. f. australis and P. f. siamensis 
to Tenasserim. There are a number of races of P. femoralis in 
the Sunda Islands. 
The Banded Leaf Monkey, Presbytis femoralis, is colored 
dark brown above, grayish white beneath. There is a well- 
marked stripe on the thigh. The hairs of the brows are pointed 
forward. A crest on the top of the head stands between a pair 
of hair whorls, and there is a thick posterior tuft. The ears and 
face are black, the chin and throat white. The typical form is 
from Singapore. The form P. f. siamensis of Selangor, Malay 
Peninsula, has the underparts white and a fleshy white area 
around the eyes and mouth; P. f. keatii of peninsular Siam has 
the underparts dark brown and a thigh stripe reaching the ankle. 
Occasionally whitish forms are found. 
The length of head and body in adults of P. /. keatii is from 
18 to 23 inches, of the tail from 29 to 33 inches. 
The Doucs, genus Pygathrix, typified by P. nemcea of 
Cochin-China, are confined to the French Indo-Chinese side 
of the Burma-Indo-Chinese peninsula, to Laos, and the Island 
of Hainan. They are distinguished by the unusually great pro- 
