168 HY DOD ADES 
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. concotor to be a distinct species and the 
typical H. LEuciscus renamed the Javan animal H. javanicus, differ- 
ing from the Bornean gray form on account of the black cap. But the 
original H. LEUuciscus 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. coNcotor), shows, the 
Bornean gray Gibbon Ape is not a distinct form, but only exhibits one 
of the many phases of color of H. coNcotor. 
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 IIIB 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 FE’. Cuvier. 
Pithecus lar (nec Linn.), E. Geoff., Ann. Mus. Hist. Nat. Paris, 
XIX, 1812, p. 88. 
Hylobates agilis F. Cuv., Hist. Nat. Mamm., 1821, pls., V, VI; 
Id. Dict. 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; FE. )Geofi,;@ours Hise. 
Nat. Mamm., 1828, p. 34, 7me Lecon; G. Cuv., Régn. Anim., 
I, 1829, p..90;, Yarss::Zool..; Journ.,, V5,1835,: pakGA gi 
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, pl.; Gray, Handb. Mamm. Brit. Mus., 1843, 
p. 2; Mill. und Schleg., Verhandl., 1839-44, p. 48; Cantor, 
Journ. Asiat. Soc. Beng., XV, 1846, p. 173; Fry, Proc. Zool. 
Soc. Lond., 1846, p. 11; Jd. Ann. Mag. Nat. Hist., XVII, Ist 
Ser., 1846, p. 484; I. Geoff., Cat. Primates, 1851, p. 7; Gerv., 
