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GENUS H Y L li A T E S . 



HYLOBATES MULLERI. 



Hvlohatcs iiiii!Icn\ Martin. Nat. Hist. Ouadr. 1841, p 444; 



This species varies from grey to dark yellowish brown, but 

 the grey in certain lights appears pure ashv, and in others of a 

 brownish tint. In some the chest and abdomen are frequently 

 of a lighter colour than the other parts, and of a brownish 

 yellow, and this seems to be the character of individuals met 

 with on the west coast of Borneo, while those inhabiting the 

 me,'idii)nal parts of the island have the hands and fore part of 

 the body of a black-brown or reddish-brown. In both of these 

 \arieties theie is a yellowish white supercilium. The last of 

 them leads into the Hylobates from the neighbouring islands 

 of Sulu to the north-east of Borneo, in which the upper 

 parts of the body are either grey or brownish, the lower part 

 of the back and the loins being a little more clear than the 

 rest. Specimens of this gibbon procured by me at Claudetown 

 and now in the British Museum show that the colouiing 

 in different parts of the body must be considered of little im- 

 portance, as I obtained eleven specimens, five of which were, in 

 the same troop and the other six from the same locality vary- 

 ing 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 nearly black all over, whilst others 

 were almost a complete silver-grey. I therefore come to the 

 conclusion that Hvlohjtcs mi'illcri and Hylnhates Iciicisciis 

 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 vSarawak. 



The natives call the silver grey \ariety Empliau or 

 \Va, Wa, and the dark (ine Empliau arang (coal) because of 

 its colour. The noise made by these gibbons is very pretty, 

 commencing punctually at five o'clock in the morning and 

 continuing till the sun is above the tops of the trees. They 

 become very tame and make very nice pets. 



Hab. Baram River (C. Hose). Mount Dulit (C. Hose). 

 Sarawak (G. D. Haviland). Batang Lupar (C. Hose). 



1- A M I J. Y C E U C IM T 11 E C I D .E . 

 (i ENU S MACACU S. 



MACACUS NEMESTRINUS. 



Macdciis ncmcstrinus F. Cuv., Hist. Nat. des Mammif. 

 Aoiit 1820, pi. xlii. Jan. 1822, pi. xliv. 



'^The general colour is a decided olive, tending in some 

 animals to brown, the variation in colour being due to the 



