]0 SIMIADiE. 



in the extent to which the toes of the hind feet are united, especially 

 in the males of different specimens, and also sometimes they arc 

 united on one foot and freo on the other of the same animal. M. 

 Is. Geoffroy, placing faith in this character, separated a species, 

 and formed for it a section of the genus, because in one male speci- 

 men ho had observed tho second and middle too united by a membrane 

 to tho socond articulation. 



Tho species aro very much aliko in appearance, and are variable 

 in colour from tho samo locality, so that one almost doubts their dis- 

 tinctness. Dr. Dahlbom has stated that thcro is a difference in the 

 skeletons : thus ho says that the bladebone of //. liajjlesii is smooth, 

 without any tubercle ; of II. leueiscus, with a single tubercle ; of If. 

 lar and H. agilis, with two tubercles, which are thin and distinct in 

 tho first, and thick and less distinct in tho second. lie also says 

 that the arms of II. Mullerii arc longer than those of II. leiuiscus. 



The species may be divided thus : — 



1. Hands and feet white ; nose rather elongate. 



a. Whiskers white. No. 1. 



b. Whiskers black. No. 2. 



2. Hands and feet like the rest of the body. 



a. Whiskers rigid, white ; frontal band none. No. 3. 



b. Whiskers soft, fluffy ; frontal baud white. Nos. 4, 5, G, 7. 



1. Hylobates lar. The Gibbon. B. M. 



Black ; circumference of tho face, and the hands and feet, white ; 

 whiskers white. 



Gibbon, Jiuffun, II. N. xiv. t. 2, 3. Homo lar, Linn. Simia lav, 

 Gmvl. llylobates lar, Illiger ; Geoff. Simia longiniana, Schrcb. 

 t. 2, f. 1. llylobates albimana, Horsf. Zool. Journ. 1820 ! 



Var. Yellowish white. — Cantor. 

 llylobates enteloides, Is. Geoff. Voy. Jacq. iv. p. 13, t. 184 ; Arch, du 

 Mus. xi. t. 29. 



Ilab. Malacca ; Siam ; Burmah ; Tenasserim, Cantor. 



" Bladebones with two slender tubercles." — Dahlbom. 



Dr. Cantor observes, on H. lar, that the index and middle toes of 

 both or of one foot, in some individuals, of whatever sex or shade of co- 

 lour, are united by.a broad web the whole length of the first phalange, 

 in some partially so, and in others not at all ; and that in II. agilis 

 the first phalange of the index and middle toe are in some individuals 

 of cither sex partially or entirely united by a web ; sometimes the 

 first phalange of tho middlo too is partially united to the fourth (Cat. 

 Mamm. Malay, p. 3). Tho ribs vary from 12 to 13 pairs. 



2. Hylobates pileatus. The Crowned Gibbon. B. M. 



Black ; shoulders and loins greyish ; hands, feet, and circumfe- 

 rence of tho face, and a ring round tho crown, white ; whiskers 

 black. 



