420 QUADRUMANA. 



Gibbons, and especially the Ungka-etam and the Ungka-puti, are timid ; 

 but, in captivity, they soon become familiar. All utter discordant, guttural 

 cries, resembling the term, Wou-wou, which is the name given, according 

 to Duvaucel, by the natives of Sumatra to the Ungka-puti (Hylobates 

 agilis), but- which is rather of general than specific signification. Camper 

 has appropriated it to the Hylobates leuciscus. According to Dr. Miiller, 

 the Gibbons live in mountain districts, where their range is limited by the 

 forests of fig-trees ; beyond which they do not ascend. They are com- 

 monly found in little troops, on the brows of the hills ; but as soon as they 

 ascertain the presence of Man, they disappear, in a few moments, among 

 the dense woods of the valleys : some appear to inhabit the tops of the 

 trees, never coming down to the ground, but traversing the forest by 

 springing from tree to tree in their passage. Their cry is loud, and may 

 be often heard resounding through the mighty woods, and re-echoed in 

 the grottoes of their wild and solitary territories. 



THE SIAMANG GIBBON. 



HYLOBATES SYNDACTYLUS. (Hylobates syndactylus, F. CUVIER, Diet. Sci. Nat. xxxvi. 287.) 



Hylobates syndactylus LESSON, Species des Mamm. p. 50. 1820. 



Pithecus syndactylus DESMAREST, Mamm. Suppl. 531. 1822. 



Simia syndactyla Siamang of Malays, RAFFLES, in Linn. Trans, xiii. p. 241. 1822. 



Simla syndactyla HORSEFIELD, Zool. Res. No. 3, fig. 3/1824. 



Simia syndactyla FISCHER, Syn. Mamm. p. 11. 1829. 



Hylobates syndactyla ..._... Appendix to Life of Sir T. S. RAFFLES. 1830. 

 Hylobates syndactylus GEOFFROY, Cours d'Hist. Nat. 



SPECIFIC CHARACTERS. Body robuSt; fur woolly, black; first and second fingers of the 

 feet united together, to the last joint ; laryngal sac. 

 LOCALITY. Sumatra. 



DESCRIPTION. The general colour is deep black ; the fur is deep, full, 

 and woolly ; on the chest and abdomen it is scanty ; the face is nearly 

 naked, exhibiting only short, close, thinly scattered hairs, of a white colour, 

 which become fuller and longer on the chin. The huge throat-pouch is 

 naked, and, when distended, the skin is smooth and shining, as if oily; 

 the mammae of the females naked, and large ; the colour of the skin is 

 universally black ; the ears are small, and concealed by the thick, deep 

 fur on the sides of the head ; the orbits are circular and prominent ; the 

 eyes sunk ; the iris hazel ; the index and middle toes are united to the 

 ultimate phalanx ; the mouth is wide ; the canines are large ; the forehead 

 is flat ; the head small ; the chest broad, and indicative of great bodily 

 vigour. 



The original specimen exists in the museum of the Zoological Society, 

 London; others, from Sir T. S. Raffles, exist in the British Museum, 

 the museum of the East India Company, and in the Musee du Roi, 

 Paris. 



