158 Lloyd's natural history. 



" at Claudetown, and now in the British Museum, show that 

 the colouring in different parts of the body must be considered 

 of httle importance, as I obtained eleven specimens, five of 

 which were in the same troop and the other six from 

 the same locality, varying in colour as much as it is possible 

 for them to do ; some had yellowish backs and black chests, 

 others black backs with yellowish chests, and some were nearly 

 black all over ; whilst others were almost a complete silver- 

 grey. I, therefore, come to the conclusion that H. nmelleri 

 and H. leuciscus cannot be separated. The peculiar bubbling 

 noise they make is similar. I think it very unlikely that two 

 distinct species should be so constantly found together as they 

 are in Sarawak. 



" The natives call the silver-grey variety ' Emplian ' or 

 *Wa-Wa,'and the dark one, 'Emplian arang ' (coal), because 

 of its colour." 



in. THE WHITE-CHEEKED GIBBON. HYLOBATES LEUCOGENYS. 



Hylohates leucogenys, Ogilby, P. Z. S., 1840, p. 20 ; Blyth 

 J. A. S. Beng., x., p. 838 (1841); Martin, Mammif. 

 Anim., p. 445, cu?n fig. (1841); Is. Geoffr., C. R., xv., p, 

 717 (1842); id., Arch. Mus., ii., p. 535 (1843); Gray, Cat 

 Monkeys Brit. Mus., p. 11(1870); Schl., Mus. Pays 

 Bas, vii., p. 13 (1876); Scl., P. Z. S., 1877, p. 679, pi. Ixx. 

 Anderson, Zool. Res. Exped. Yun-nan, p. 6 (1878; with 

 synonomy). 



Characters. — Fur glossy, thick, and woolly; the hair of the 

 upper and back part of the head standing vertically erect ; the 

 face, chin, and ears black; round the face from the level of the 

 eyes and meeting below the chin runs a white border, forming 



