1 66 LLOYDS NATURAL HISTORY. 



robust Ape exhibited in its arms equally perfect powers of 

 climbing ; but it moved with the greatest circumspection, de- 

 liberation, and composure, exhibiting none of the volatile activity 

 so characteristic of the Gibbons ; but moving only one pair of 

 its limbs at a time, and only when the other pair had firm 

 hold of some support. 



Vn. THE SL\MANG GIBBON. HYLOBATES SYNDACTYLUS. 



Pithecus syndactylus, Desmar., Mamm., p. 531 (1820). 

 Bylobates sy?idactylus,'P .CuY.^Yiht Nat.Mammif., pi. iv. (1821); 

 Is. Geoffr., Cat. Meth. Primates, p. 9 (1851); Bennett, 

 Wanderings in N. S. Wales, ii., p. 151 (1834); Martin, 

 Mammif. An., p. 420 (1841) ; Flower, Nat. Hist. Rev., 

 1863, p. 279 (cum fig.); Giebel, Z. Ges.Nat.,p. 186(1866); 

 Schl., Mus. Pays-Bas, vii., p. 22 (1876) ; Anderson, Zool. 

 Res. Exped. Yun-nan, p. 10 (1878; with full synonymy). 

 Simia syndactylus^ Raffl., Tr. Linn. Soc, xiii., p. 241 (1822). 

 Siamanga syndadyla^ Gray, Cat. Monkeys Brit. Mus., p. 9 

 (1870), id., op. cit.^ p. 9 (1870); H. O. Forbes, Nat. 

 Wand. East. Arch., p. 129 (1885). 

 ^riattXXXVIlI.) 

 Characters. — This is the largest species of the genus, measur- 

 ing more than three feet ; it is stouter than H. hoolock^ and its 

 hair is entirely glossy black, having no white hairs anywhere ; 

 the face is black, as is also the distensible skin of the large bare 

 patch on the throat, which overlies its great laryngeal pouch. 

 The second and middle toes are united by a web as far as the 

 last joint. The hair on the arms and fore-arms converges to- 

 wards the elbow. 



The skulls in most of the species of this genus closely re- 

 semble each other ; that of the Siamang is distinguished by its 



