5. HTLOBATKS. 



Tribe II. HYLOBATINA. 



Body and limbs slender. Hands and feet long, slender. Buttocks 

 callous. Hah. Asia and Asiatic islands. 



4. SIAMANGA. 



The arms very long, reaching to the feet ; claws channelled ; 

 the second and third toes united as far as the joint between the 

 second and third phalanges ; the thi-oat very dilatile, of male naked, of 

 female covered witli hair. Skull with an elongated, compressed face, 

 the lower jaw nearly as wide behind as in front. Uab. Asiatic 

 islands. 



Siamanga, Gray, List Mamm. B. 31. p. 2. Syudactylus, Hoitard. 



Siamanga syndactyla. The Siamang. B. M. 



Black-woolly, chin and upper Up whitish. 



Vur. WnitQ.—Raffies. 



Simia sjoidactyla, Linn. Trans. 1821 ! Pithecus sjaulactylus, Dcsm. 

 flvloiaates s-^-ndactylus, Horsf. ! Siamanga s\Tidact\la," Gruu, List 

 Mamm. B. M. p. 2 ! 



Hah. Sumatra ; Java. 



5. HYLOBATES. 



Arms reaching to the feet ; claws channelled ; second and third 

 toes slightly imitcd in the males, free in the females ; thi'oat haiiy; 

 head round. Skidl with a short, less compressed face; the lower jaw 

 much narrower at the end of the tooth-line than in fi-ont. Hah. 

 Asia and Asiatic islands. 



Gibbon, Buffon, 17G6. Hylobates, LUiger, 1811. Brachiopithecus, 

 partly, Blainv. 



The specimens of the genus are very variable in colom-, and hence 

 they have been divided into several species, the species being often 

 described from a .single individual. 



Some authors defend this practice by the fact that the natives of 

 the country where they are found give them different names — that is, 

 call a white specimen a "WTiite Tnko, and a black one a Black Unko ; 

 but this appears to be only as we call horses white, bay, or brown, 

 without regarding them as distinct species. 



When several specimens are received from the same localitv, as 

 of //. lar from Malacca, or //. piJcutus from Siam, the general 

 colour of the animals varies from black to grey and to white. General 

 Hardwicke figures the specimens found in the Himalaya as varying 

 in the same manner. 



Dr. Cantor and other naturalists who have had the opportunitj- of 

 examining these aiiimals alive state that there is a great variation 



