6 PRIMATES, CARNIVORES AND UNGULATES 



support confinement for any length of time. In the skull the 

 nasal aperture extends considerably above the lower level of 

 the orbits. The thumb is well developed and a row of stiff 

 black hairs projects above the eyes. The young differ in 

 colour from the adults. Malay name " Lotong." 



Key to the Species. 



A. Last lower molar with five well-developed cusps ; 



inner side of thigh not lighter than outer side. 



a. Colour blackish, hair of head growing 



forward on crown and temples in three 

 distinct peaks ... ... P. CRISTATA. 



b. Colour ashy, hair of head falling back- 



wards from crown and nape and forming 



a distinct flat nuchal cap ... P. OBSCURUS. 



B. Last lower molar with only four cusps or with a very 



rudimentary posterior fifth cusp ; inner side of 

 thigh lighter than, and sharply margined from, 

 outer side ; hair of head radiating from two 

 points on forehead and growing backwards on 

 temples, upwards on crown and nape in a 

 median ridge. 



a. Colour blackish, sides of neck and rump 



dark ... ... P. FEMORALIS. 



b. Colour ashy, sides of neck and rump pale 



P. ALBOCINEREUS. 



4.* PRESBYTES CRISTATA (Raffles). The Silvered Leaf- 

 Monkey. Semnopitheciis cristatus, Cantor, Jour. As. 

 Soc. Bengal, 1846. 



Malay name " Klabu." 



Pelage black or sooty, strongly washed throughout with 

 silvery or yellowish white. Hands and feet and skin of face 

 black. Head and body about 21 inches, tail 30 inches. 



Jour. Straits Branch 



