5. HYLOBATES. 9 



Tribe II. HYLOBATINA. 



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

 callous. JIab. Asia aud Asiatic islands. 



4. SIAMANGA. 



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

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

 second and third phalanges ; the throat very dilatile, of male naked, of 

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

 tlio lower jaw nearly as wido behind as in front. Uab. Asiatic 

 islands. 



Siamanga, Gray, List Mamm. B. 31. p. 2. Syndactylus, Boitard. 



Siamanga syndactyla. The Siamang. B. M. 



Black-woolly, chin and upper lip whitish. 



Var. White.— Baffles. 



Simia syndactyla, Linn. Trans. 1821 ! Pithecus syndactylus, Dcsm. 

 Ilylobates syndactylus, Ilorsf. ! Siamanga syndactyla, Gray, List 

 Mamm. B. M. p. 2 ! 



Uab. Sumatra; Java. 



5. HYLOBATES. 



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

 toes slightly united in the males, free in the females ; throat hairy; 

 head round. Skull with a short, loss compressed face; the lower jaw 

 much narrower at the end of tho tooth-line than in front. Uab. 

 Asia and Asiatic islands. 



Gibbon, Bujfon, 1700. Ilylobates, Illigcr, 1811. Brachiopithecus, 

 partly, Blainv. 



The specimens of tho genus arc vory variable in colour, and hence 

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

 described from a single individual. 



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

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

 call a white specimen a White Unko, and a black one a Black Unko ; 

 but this appears to bo only as wo call horses white, bay, or brown, 

 without regarding them as distinct species. 



When several specimens arc received from the same locality, as 

 of //. lar from Malacca, or IT. pileatus from Siam, tho 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 bad the opportunity of 

 examining these animals alive state that, there is a great variation 



