12 



SIMIAD2E. 



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



Fur testaceous brown ; back paler ; frontal streak and the soft 

 fluffy whiskers pale brown. 



Hylobates agilis (Wouwou), F. Cuv. Mamm. Lith. t. ; Ruffles ! 

 Cantor ! II. variegatus, Dcsm. 



Ilab. Sumatra, llajjles. 



Var. Fur brownish white. B. M. 



Hab. Sumatra? Malacca, Cantor. 



Dr. Dahlbom describes the skeleton of //. agilis (F. Cuv.), and 

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



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



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

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

 soft, full. 



Wou-wou, Camper, not F. Cuv. Simia leuciscus, Schreb. Hylo- 

 bates leuciscus, Kuhl; Ilorsfield ! Simia Moloch, Audeb. § 2, t. 1. 



Hab. 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 ono tubercle. 



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

 paler, and forehead blackish. Hab. Solo Islands. — Mus. Paris. 



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

 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 only as 

 long as, the leys. WaVcing on all fours. Tail distinct, often 

 elongate, but never prehensile. Buttoclcs callous. 



Tribe III. TRESBYTINA. 



Head roundish. Nostrils on the- sloping face. Hands and feet very 

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

 complicated of several pouches. 



Simia seninopithecus, Dahlbom. 



a. Thumb short. Asia. 



6. NASALIS. 



Nose veiy 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. Rhynchopitliecus, Dahlbom, Zool. Stud. p. 91, 1837. 



