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 Hylobates hoolock. 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. hoolock in Arakan is not." 



Hylobates henrici Pousargues. * 



Hvlobates henrici Pousarg., Bull. Mus. Hist. Nat., Paris, 1896, 

 p. 367, ?. 



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, pi.; 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, Simiae, 

 1876, p. 13 ; Sclat., Proc. Zool. Soc. Lond., 1877, p. 679, pi. 

 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. 



