4 Mammals of Burma. [No. 1, 



of any object by which the animal can assist itself along, even as a human 

 being commonly grasps a banister when ascending a stair-case. Upon the 

 forest trees, however, the Gibbons swing themselves about or forward 

 by means of their upper limbs only, with extreme facility and grace, and 

 at a marvellous rate of speed when duly exerting themselves, taking the 

 most astounding hand-leaps in rapid and continuous succession when in full 

 career. They are further remarkable for their exceedingly loud shouting 

 cries, not unmusical in tone, which are often uttered in concert, and differ 

 more or less in the different species. 



Dr. Gray separates the Siamang from Hylolates, and expresses a 

 suspicion that all the rest may prove to be local varieties of one species. 

 I am familiar with four of them in the living state, and I consider 

 these to be sufficiently well distinguished to rank as species. No one who 

 knows the two could well confound a white-browed with a white-handed 

 Gibbon, and their voices differ considerably. To the best of my recol- 

 lection, that of H. variegatus also differs very appreciably from these; 

 and the voice of H. leuciscm, which is peculiar to Java, I do not re- 

 member to have heard. Of the Bornean H. concolor {Simia concolor, Har- 

 lan, H. harlani, Lesson), I have only seen mounted skins, and it is most 

 nearly akin to S. variegatus, if indeed separable from it ; and H. funereus, 

 Is. Geoff., is another alleged species inhabiting the "Solo" or Sulu Archi- 

 pelago.* Living specimens of both of the latter require to be compared 

 with living specimens of H. variegatus. 



Fam. Papionidse. 



Monkeys with simple stomach, and provided with cheek-pouches; inclusive of the 



African Baboons. 

 *3. Ihttus leonintjs. 

 Inuus leoninus, Blyth, Catalogue of the Mammalia in the Museum of the Asiatic Society 

 of Bengal, 1863, p. 7, No. 14; Manama nemestrinui? var., J. A. S. B. vol. xiii. p. 473; 

 I. orctoidea? ibid. vol. xvi. p. 731; M. andamanemis, Bartlett, P. Z. S. 1869, p. 467 

 and fig.; 1870, pp. 220, 663, and pi. xxxv., p. 598. Myoui-la-hoing, Arakan; Myouk-me, 

 Tenasserim, Mason. 



The Long-haired Pig-tail Monkey was originally described from two 

 skins without skull or other bones attached, which were transmitted to 

 Calcutta from Arakan by the author of the present paper. One was 

 that of a particularly fine male, with hair on the fore-quarters from 

 four to five inches long, and the tail-tuft of a deep ferruginous colour, 



* Archives du Museum, torn. v. p. 532, pi. xxvi. 



