5, HYLOBATES, 11 
Onko, Tabraca, Hist, de Siam, ii. p. 808, 1771. Hylobates pileatus, 
Gray, Proc. Zool, Soc. 1861, p. B56, t. 21! 
Var. 1. Black. B. M. 
Var, 2. Dirty white ; crown, whiskers, and belly black. 3B. M. 
Var. 3. White; crown-spot and belly black; whiskers white. B. M. 
Var. 4. White, except the black bristles on the eyebrow. 3B.M. 
Hab. Siam, Mouhot. 
3. Hylobates leucogenys. The White-cheeked Gibbon. B.M. 
Black ; throat and sides of cheeks with a broad white spot of 
spreading rigid hairs; forehead black, without any frontal band. 
Hylobates Jenene Ogilby, Proc. Zool. Soc. 1840, p. 20! Martin, 
Monkeys, p. 445, t 
Hab. 
4, Hylobates hoolock. The Indian Hylobates. 
Black; frontal band grey; whiskers soft and fluffy, black or 
greyish black. B.M. 
Simia hoolock, Harlan, Trans. Amer. Phil. Soc. iv. p. 52, 1834; Is. 
Geoff. Hylobates hoolock, Lesson; Martin, Monkeys, p. ” 438, fs 274, 
275. Hylobates scyrites, "Ogilby yt 
Var.? Fur brownish. B. M. 
Hylobates fuscus, Lewis, Boston Journal N. H. i. p. 33. 
Var. Fur pale yellowish-brown ; frontal band white; whiskers 
bushy, darker brown. 
Hylobates choromandus, Ogilby, Proc. Zool. Soc, 1837, p. 68! Martin, 
“Quad, 442, f. ! 
Hab. India: Himalaya Mountains, Hardwicke. 
5. Hylobates Rafflesii. Zhe Malay Gibbon. B.M. 
Black ; frontal band white ; whiskers soft and fluffy, full black. 
Simia lar, Raffles, Trans. Linn. Soc. xiii. p. 242. Hylobates Rafflesii, 
Geoff. ; F. Cuv. Mamm. aes Is. Geoff. Hylobates agilis, var., 
Martin, Quad. p. 425, t.! lobates concolor, Harlan, Journ. 
Acad, N.S. Philad. v. p. 229, ae Harlani, Lesson. 
Hab. Sumatra. 
Var. Dark brown; frontal band distinct. 
lobates concolor, 8. Miiller, Verhund. t.! (not Harlan). Hylo- 
Pte Miilleri, Martin, Monkeys, i. i. p. 4; Is. Geoff. 
Hab. Borneo. 
Dr. Dahlbom describes the skeleton, which has the bladebone 
smooth, without any tubercles. 
