1846.] the Malayan Peninsula and Islands. 173 



The colour varies from blackish-brown to light- brown, yellowish or 

 dirty- white, sometimes uniform, sometimes mottled. The index and 

 middle toes, of both or of one foot, are in some individuals, of whatever 

 sex or shade of colour, united by a broad web throughout the whole of 

 the first phalanx ; in some partially so, and in others not. The ribs 

 vary from twelve (7+5) to thirteen pairs (7 + 6,) as observed by Mr. 

 Blyth, (Journal Asiatic Society 1841, Vol. X. p. 839.) 

 Hylobates agilis, F. Cuvier. 

 Var. Ungka etam, Martin. 

 Syn. — Ungka etam, Raffles. 



Oungka, Hylobates Lar, F. Cuv. 

 Simia Lar, Vigors and Horsfield. 

 Hylobates Raffle sii, Geoff, apud Ogilby. 

 Hylobates variegatus, Miiller apud Schinz*. 

 ■' Ungka etam" of the Malays of the Peninsula. 

 Hab. — Malayan Peninsula, (Malacca. Pur lis, Keddah, Pungah.J 

 Sumatra. 

 The first phalanges of the index and middle toe are in some individu- 

 als of either sex, partially or entirely united by a web. Sometimes the 

 first phalanx of the middle toe is partially united to the fourth. 



An adult male examined, had thirteen pair of ribs (6 + 7), an adult 

 female fourteen, (7+7), a young male on the left side thirteen (7+6), 

 on the right twelve (7 + 5). In these three individuals the stomach 

 was constricted at the fundus and the pyloric part, which characters, when 

 compared with specimens of Hylobates agilis from Sumatra, will go far 

 to decide the identity of that species and H. Rafflesii. On the Malayan 

 Peninsula, the latter appears to be less numerous than H. Lar. The 

 light-coloured Var. of H. agilis I have not seen. 



Hylobates leuciscus, Kuhl. 

 Syn. — " Wou-wou," Camper. 

 Simia leucisca, Schreber. 

 Simia moloch, Audebert. 

 Pithecus cinereus, Latreille. 

 Pithecus leuciscus, Geoffroy. 

 Pithecus leuciscus, apud Desmarest. 



* Schinz gives as a synonyme : Pithecus varieyatus, Geoff, which, however, is Hy- 

 lobates Lar, Var. 



