168 HYLOBATES 



This species is confined to Java, a style resembling it somewhat 

 is found in Borneo, being only one of the variations exhibited by H. 

 CONCOLOR. This species varies less than many of its relatives, and 

 this is confined mainly to the extent of the black cap on the head. 

 The Bornean gray variety sometimes has a faint blackish cap also 

 varying in size and in depth of hue, but I have never seen any having 

 a jet black cap as is witnessed in Javan examples. Herr Matschie sup- 

 posing the gray form of H. concolor to be a distinct species and the 

 typical H. leuciscus renamed the Javan animal H. javankus, differ- 

 ing from the Bornean gray form on account of the black cap. But the 

 original H. leuciscus came from Java, and if there was a specific 

 difference between it and the Bornean animal, it was not the Javan 

 ape that should have received a new name. However as Mr. Hose's 

 testimony, (reproduced in the article on H. concolor), shows, the 

 Bornean gray Gibbon Ape is not a distinct form, but only exhibits one 

 of the many phases of color of H. concolor. 



Schreber has frequently been quoted as the describer of this 

 form, but he makes no mention of it whatever in his work, and the 

 plate niB is not Schreber 's, but a supplementary one of Wagner, 

 who attributes leuciscus to Schreber, (1840, p. 78), without, so far 

 as I can discover, any reason whatever for so doing. The first de- 

 scription given of the species appears to be that of E. Geoffroy (1. c). 



Hylobates agilis F. Cuvier. 



Pithecus lar (nee Linn.), E. Geoff'., Ann. Mus. Hist. Nat. Paris, 

 XIX, 1812, p. 88. 



Hylobates agilis F. Guv., Hist. Nat. Mamm., 1821, pis., V, VI; 

 Id. Diet. Scien. Nat., XXXVI, 1825, p. 288; Less., Man. 

 Mamm., 1827, p. 31; Temm., Mon. Mamm., I, 1827, p. 13; 

 Griff., Anim. Kingd., V, 1827, p. 7; E. Geoff., Cours Hist. 

 Nat. Mamm., 1828, p. 34, 7me LeQon ; G. Cuv., Regn. Anim., 

 I, 1829, p. 90; Yarr., Zool. Journ., V, 1835, p. 137; Miill., 

 Tijdsch. Natuur. Gesch. Phys., II, 1835, p. 326; Waterh., Cat. 

 Mamm. Mus. Zool. Soc. Lond., 1838, 2nd ed., p. 3; Blyth, 

 Journ. Asiat. Soc. Beng., X, 1841, p. 838; XIII, 1844, p. 465; 

 XLIV, 1875, ext. no. p. 3; Martin, Mammif. Anim., 1841, 

 pp. 416, 417, 425, pi. ; Gray, Handb. Mamm. Brit. Mus., 1843, 

 p. 2; Miill. und Schleg., Verhandl., 1839-44, p. 48; Cantor, 

 Journ. Asiat. Soc. Beng., XV, 1846, p. 173 ; Fry, Proc. Zool. 

 Soc. Lond., 1846, p. 11 ; Id. Ann. Mag. Nat. Hist., XVII, 1st 

 Ser., 1846, p. 484; I. Geoff., Cat. Primates, 1851, p. 7; Gerv., 



