4 PRIMATES, CARNIVORKS AND UNGULATES 



Limits of range in the Peninsula unknown, but the 

 species is found throughout the F. M. S., especially in hilly 

 country, from Upper Perak to Negri Sembilan and eastward 

 to Gunong Tahan : not known in Johore. 



Genus Hylobates. 



The Gibbons are, with the exception of one species of 

 Symphalangus, the smallest of the anthropoids. They have 

 no naked gular sac, the membrane between the toes, though 

 occasionally present, occurs only in a very modified form, the 

 hair of the forearm grows towards the wrist and the mandible 

 is relatively the lightest and most fragile of all the Simiidae ; 

 otherwise their general resemblance to the Siamang is very 

 close. Their cry is a series of loud ringing calls uttered most 

 frequently in the early morning. 



Key to the Species. 



A. Hands and feet distinctly whitish ... H. LAB. 



B. Hands and feet of the same colour as body ... H. AGILIS. 



2. HYLOBATES LAB, (Linn.) The White-handed Gibbon. 

 Blanford, p. 7. 



Colour of fur varies from pale brownish buff (biscuit- 

 colour) to sooty brown, and is sometimes piebald. The dark 

 form is most numerous but individuals of every tint mate 

 together and parents of one colour often have infants of the 

 other. Hands feet and a ring of hair round the face whitish, 

 always to be distinguished even in the palest individuals. 

 Length of head and body about 18 inches. 



Throughout the Peninsula but not in the adjacent islands. 



3.* Hylobates agilis, F. Cuvier. The Agile Gibbon. 

 Cantor Jour. As. Soc. Bengal, 1846. 



Eesembles Hylobates lar in colour and in variability but 

 hands and feet are always concolorous with the limbs and 

 body. 



Jour. Straits Branch 



