HYLOBATES. 7 



The specimens in London and Paris exactly agree with each other. 



This species inhabits Siam (Paris Museum), and is probably closely allied to 

 those forms of E.. pileatus in which the animals are wholly black with the exception 

 of the whiskers ; so that it seems to be so closely related to H. pileatus that the two 

 may ultimately prove to be identical. 



Hylobates letjciscus, Schreber. 



The Wow Wow, Camper, Allgemeene Vaterlaud. Letterfn. i. p. 18. 



The Long-armed Ape, Pennant, Hist. Quad. vol. i. 3rd ed. 1793, pi. xxxvili. 



The Long-armed Ape (var. B), Pennant, Hist. Quad. vol. i. 3rd ed. 1793, p. 184. 



Le Moloch, Audebert, Hist. Nat. des Singes, 1"^ fam. sect. ii. pi. ii. 



The Long-armed Ape (white var.), Shaw, Gen. Zool. vol. i. pt. 1, 1840, p. 13, pi. vi. 



Le Gibbon cendre, Latr. Hist. Nat. BufFon (Sonnini ed.), vol. xxxv. (1809) p. 207, pi. x. 



Simla leucisca, Schreber, Saugeth. tab. iii. b, 1775. 



Pithecus leuciscus, Geoff. St.-Hil. Ann. du Mus. vol. xix. 1812, p. 89. 



Hylobates leuciscus, Kuhl, Beitr. zur Zool. 1820, p. 6; Desmarest, Mamm. 1820, p. 51; F. Cuvier, 

 Diet, des Sc. Nat. xxxvi. 1825, p. 289; Lesson. Man. de Mamm. 1827, p. 31; Griffith, 

 An. Kingd. vol. v. 1827, p. 6; Bory de St. Vincent, Diet. Class. d'Hist. Nat. vol. xii. 1827, 

 p. 284; G. Cuv. Reg. An. vol. i. (nouv. ed.) 1829, p. 90 ; Fischer, Syn. Mamm. 1829, p. 12 ; 

 Is. Geoff. St.-Hil. Belanger's Voy. aux Ind. Orient., ZooL 1834, p. 26; Compt. Rend. 

 vol. XV. 1842, p. 716; Cat. Method, des Mammif. 1851, p. 7; Arch, du Mus. vol. v. 1852, 

 p. 534; Miiller, Tijdach. voor Natuur. Gesch. en Phys. vol. ii. 1835, p. 327; Schlegel, Essai 

 sur la Physion. des Serpens, Pt. Gen. 1837, p. 237 ; Waterhouse, Cat. Mamm. Mus. Zool. 

 Soc. Loud. 1838, 2nd ed. p. 4; Wagner, Schreber, Saugeth. Suppl. vol. i. 1840, p. 78, 

 pi. iii. b; Lesson, Sp. des Mammif. 1840, p. 51; Martin, Hist. Quad, or Monkeys, 1841, 

 pp. 416, 417, 436; S. MiiUer, Verhandl. over de Zool. van den indisch. Arch. 1839—44, 

 p. 15; Gray, Hand-list Mamm. B. M. 1843, p. 2; Cat. Monkeys and Lemurs, B. M. 1870, 

 p. 12; Muller und Schlegel, Verhandl. 1839 — 44, p. 48; Blyth, Journ. As. Soc. Beng. vol. xiii. 

 1844, p. 465; Ibid, vol. xliv. 1875, ex. no. p. 4; Cat. Mamm. As. Soc. Mus. 1863, p. 5; 

 Schinz. Syn. Mamm. vol. i. 1842, p. 31; Cantor, Journ. As. Soc. Beng. vol. xv. 1846, p. 173; 

 Gervais, Hist. Nat. des Mammif. 1854, p. 53 (fig. of head) ; Wagner, Schreber, Saugeth. 

 Suppl. vol. v. 1855, p. 16; Dahlbom, Stud. Zool. Fam. Regn. An. 1856, pp. 73, 74; Giebel, 

 Zeitsehr. ges. Ntrwiss. 1876, p. 168 (skull); Bischoff, Abh. Bayr. Ak. Wiss. vol. x. 1870, 

 p. 119, 5 plates (pi. i. head). 



General colour, uniform grey, paler on the lower region of the back ; area 

 around the face paler than the other parts, with the exception of the frontal 

 streak, which is more or less conspicuous. The top of the head is occasionally 

 blackish or dark brown, forming a kind of cap, but in others it is very obscure ; the 

 fingers and toes tend to blackish. The fur is dense, profuse, and rather long and 

 woolly. 



Inhabits Java. 



The Bornean Gibbon (J?. miilleri, Martin) appears to be closely allied to this 

 species, but the materials at our disposal are not yet sufficient to determine whether 

 the two are specifically identical. 



It is, however, noteworthy that two animals corresponding to n. leuciscus and 

 to S. miilleri, now living together in the Calcutta gardens, both utter undistin- 



