2 Mammals of Burma. 



three differently coloured individuals, representing what I consider to he 

 •varieties of H. lar from Cambodja, by the name H. pileatus, have also been 

 figured by Dr. Gray.*' The dubious B. pileatus is supposed by Mr. Swinhoe 

 to be the particular kind of Gibbon which inhabits the Chinese island of 

 Hainan, and he also reports the alleged existence of a black species of long- 

 armed Ape in the country West of Canton, f The variations of colour of 

 B. hoolock and B. lar I have elsewhere described ; % and I have seen 

 examples of B. lar from the Malayan peninsula corresponding to the figures 

 assigned to the supposed B. pileatus. 



Both the White-browed and the White-handed Gibbons vary exceed- 

 ingly in shade of hue, from black to sullied white and pale fulvescent; 

 the two sexes equally of B. lar, but the females only, so far as I have seen, 

 of B. hoolock. The males of the latter would appear to be constantly black, 

 the females rarely so, at least in Assam, though according to Colonel Tickell 

 both sexes of it are always black in Arakan. A pale specimen from 

 Sandoway has nevertheless been recorded. § In the opinion of Col. Tickell 

 the Gibbon of Arakan is different from that inhabiting the forests and hills 

 of Kachar, Manipur, and Assam, "or, if the same," the latter "is so strongly 

 modified as to be larger and stouter, with a totally different call, and subject 

 to vary the same as B. lar, which B. hoolock in Arakan is not." || I 

 remember seeing a pair of tame Hoolocks, about full-grown, at Akyab, at a 

 time when I had long been familiar with the animal, which is not rarely 

 brought to Calcutta from the Garo and other hill-ranges bordering upon the 

 valley of the Brahmaputra ; and I failed to perceive the slightest difference 

 in voice or any other particular. 



Whatever the rest of the colouring may be, B. hoolock has constantly 

 a broad white frontal band either continuous or divided in the middle; 

 while B. lar has invariably white hands and feet, less brightly so, in some, 

 and a white ring, encircling the visage, which is seldom incomplete. Some 

 of both species are variegated or parti-coloured; and the pale examples 

 of B. lar constitute the supposed B. entelloides.\ Whether the two any- 

 where inhabit the same forests, and what the limits of the range of either 

 of them may be, has yet to be ascertained, but the habits which Tickell 

 and I have detailed may be considered to have generic application.** 



* P. Z. S. 1861, p. 136, pi. xxi. f ibid. 1870, pp. 224, 615. 



+ J. A. S. B. xvi. pp. 729, 730. § ibid. xiii. p. 464. 



|| ibid, xxxiii. p. 196. % Archives du Museum, torn. ii. p. 532, t. 1. 



** J. A. S. B. xiii. p. 464, and Tickell, ibid. vol. xxxiii. p. 196. 



