HYLOBATES 165 
it is found throughout Burma proper or not, I cannot ascertain. To 
the west of the spur dividing British Burma from Arakan, and 
throughout the latter province into the mountains east of Chittagong, 
is found only HyLopates HooLtock. And further northward in the 
forests and hills of Cachar, Munnipoor and Asam, exists either a 
third species (not yet I believe distinguished by Naturalists), or if 
the same species as H. HOOLOCK, so strongly modified as to be larger 
and stouter, with a totally different call, and subject to vary in color 
the same as H. Lar, which H. Hootocx in Arakan is not.” 
HYLOBATES HENRICI Pousargues. 
Hylobates henrici Pousarg., Bull. Mus. Hist. Nat., Paris, 1896, 
Dent? ate: 
PRINCE HENRY OF ORLEANS’ GIBBON. 
Type locality. Lai-chau, (Tonkin), north of Black River, near 
border of Yunnan. 
Color. Top of head and occiput in the center black, the spot con- 
tinues as a black line on back of neck; sides of head, chin, throat, 
and shoulders, ochraceous rufous; forehead ochraceous buff ; body and 
limbs buff. Ex type Paris Museum. Flat skin, incomplete; arms 
from elbows and legs from knees lacking. In another specimen the 
hands and feet are yellowish white. 
Measurements. Head and body, 990. 
Whether this is a phase of H. Lar from a new locality or a dis- 
tinct form cannot yet be definitely determined. More adult examples 
must be obtained before its status in the group can be fixed. 
HYLOBATES LEUCOGENYS Ogilby. 
Hylobates leucogenys Ogilby, Proc. Zool. Soc. Lond., 1840, p. 20; 
Blyth, Journ. Asiat. Soc. Beng., X, 1841, p. 838; Martin, 
Mammif. Anim., 1841, p. 445, pl.; I. Geoff., Compt Rend., 
XV, 1842, p. 717; Id. Archiv. Mus. Hist. Nat., Paris, II, 
1843, p. 535; Schinz, Syn. Mamm., I, 1844, p. 28; Gerv., Hist. 
Nat. Mamm., I, 1854, p. 54; Wagn., Schreb., Saugth. Suppl., 
V, 1855, p. 20; Reichenb., Vollstand. Naturg. Affen, 1862, p. 
171, fig. 428; Gray, Cat. Monkeys, Lemurs and Fruit-eating 
Bats, Brit. Mus., 1870, p. 11; Schleg., Mus. Pays-Bas, Simiz, 
1876, p. 13; Sclat., Proc. Zool. Soc. Lond., 1877, p. 679, pl. 
LXX; Anders., Zool. Res. Exped. Yunnan, 1878, p. 6; Id. 
Cat. Mamm. Ind. Mus. Calc., 1881, p. 34; Forbes, Handb. 
Primates, II, 1894, p. 158. 
