66 MAMMALS OF THE PACIFIC WORLD 



is found only on the islands of North and South Pagi, Sipora, 

 and Siberut, West Sumatra. 



The White-handed Gibbon {Hylohates lar), found from 

 lower Burma and Cambodia to Sumatra, has a black and a pale 

 color phase, irrespective of sex. It differs from the other gib- 

 bons in the fact that the hands and feet are of a lighter color 

 than the arms and legs. The black phase is sometimes griz- 

 zled behind the shoulders and its black face is framed with a 

 ring of white hairs which varies considerably in width. Al- 

 though the light phase may range in color from dark brown 

 to very light buff, the white hairs about the face and the con- 

 trastingly lighter hands and feet are always noticeable. 



The Agile or Dark-handed Gibbon {Hylohates agilis), al- 

 though the same size as the white-handed gibbon, differs from 

 that animal in having the hands and feet the same color as the 

 arms and legs. Color phases exist in this gibbon also. In the 

 black phase the back is apt to be brown. The white line encir- 

 cling the face is more variable in this gibbon, in some specimens 

 spreading to the throat and cheeks and in others reduced to a 

 white band on the brow. The pale phase of the agile gibbon 

 resembles that of the white-handed gibbon in all but the hands 

 and feet, which are dark. The agile gibbon is found in the 

 Malay States and Sumatra. 



The Gray Gibbon (Hylohates moloch) of Java and Borneo 

 is distinguished from both of the preceding by the fact that 

 the color of all individuals is uniformly gray, and there are 

 no color phases. The color is usually ashy gray — in some 

 specimens brownish gray — paler on the back and rump, with 

 a dark patch on the top of the head. The gray gibbon of 

 Borneo has been divided into a number of local races. These 

 are browner than the Javan form and their underparts are 

 darker than the back. Some specimens may have the underparts 

 blackish. 



