12 STMIADJJ. 



6. Hylobates agilis. The Slender Oihbon. B. M. 



Fur testaceous bro^Tn ; back paler ; frontal streak and the soft 

 fluffy whiskers pale brown. 



Hylobates agilis (Wouwou), F. Ciiv. Mamm. Lith. t.; Rdffles \ 

 Cantor ! H. vaiiegatus, Des?n. 



Hah. Sumatra, Baffies. 



Var. Fur brownish white. B. M. 



Hah. Sumatra? Malacca, Cantor. 



Dr. Dahlbom describes the skeleton of H. acjills (F. Cuv.), and 

 states that it has two large, strong tubercles on the bladebone. 



7. Hylobates leuciscus. The Wou-wou. B. M. 



Ashy grey or bluish grey ; crown of head with a large square 

 black spot ; frontal band and circumference of face paler ; whiskers 

 soft, full. 



Wou-wou, Camper, Bot F. Cuv. Siniia leuciscus, Schreb. Hylo- 

 bates leuciscus, Kuhl ; Horsjield ! Siuiia Moloch, Amleh. § 2, t. 1. 



Hah. Java ; Sumatra. 



See Hylobates funereus. Is. Geoff. Arch, du Mus. v. p. 532, t. 26. 



Dr. Dahlbom describes the skeleton as having a bladebone with 

 only one tubercle. 



Fur of upper parts of body and outside of limbs ash-grey, of loins 

 paler, and forehead blackish. Hah. Solo Islands. — Mm. Paris. 



I am much inclined to believe that all these Malayan HyJohatcv, 

 with perhaps the Indian one, are one species ; but I have kept them 

 distinct on account of the difference in the skeletons mentioned by 

 Dr. Dahlbom. 



Section B. Quadrupedal. The arms shorter than, or onh/ as 

 long as, the legs. Walking on all fours. Tail distinct, often 

 elongate, hut never prehensile. Buttocks callous. 



Tribe III. PEESBYTINA. 



Head roimdish. Nostrils on the sloping face. Hands aiul feet very 

 long, slender. Thumb small or wanting. Tail very long. Stomach 

 comphcated of several pouches. 

 Simla semuopithecus, DaMbom. 



a. Thumb short. Asia. 



6. NASALIS. 



Nose very prominent, conical ; the nostrils inferior. Body and 

 limbs robust. Thumb short, perfect. Cheek-pouches none. Orbits of 

 skull moderate or rather small. Hub. Asia. 



Nasalis, Geoff. Rhyncliopitbecus, Dahlbom, Zool Stud. p. !.)!, 1837. 



