1876. 
1876. 
1884. 
1878. 
1892. 
1909, 
1911. 
HYLOBATES 153 
LEUCOGENYS; H. HooLocxk; H. rafflesi = H. acitis; H. acILis; 
and H. LEucIscus. 
Pousargues, in Bulletin du Muséum d’Histotre Naturelle, Paris. 
HyYLoBATES HENRICI first described. 
Schlegel, in Muséum des Pays-Bas, Simie. 
After reviewing briefly the distribution of HyLoBaTEs as 
species, the Author divides those recognized by him, into two 
groups, the second having only one species H. SYNDACTYLUS 
- which is almost universally regarded as representing a distinct 
genus, SYMPHALANGUS. The other species recognized are H. 
LAR; H. PILEATUS; H. HooLocK; H. acitis; H. LtEuciscus; H. 
CONCOLOR ; H. miilleri = H. CONCOLOR. 
Kiinckel, in Sciences Naturelles, Paris. 
HyYLOBATES NASUTUS first described. 
Anderson, Anatomical and Zoological Researches and Zoolog- 
ical Results of the Yunnan Expeditions. 
In this work a synopsis of the species is given with a full 
synonymy and discussion of the specific values. The species 
recognized are H. HooLockx; H. Lar, with pale variety H. en- 
telloides; H. FUNEREUS ex Sulu as a synonym. H. acitis; H. 
SYNDACTYLUS, belonging to the genus SyMPHALANGUS; H. Fus- 
cus; and H. concotor Harlan. 
Thomas, in Annals and Magazine of Natural History. 
HyLoBATEs NASUTUS redescribed as H. hainanus. 
Thomas, in Annals and Magazine of Natural History. 
HyYLoBATES GABRIELLI first described. 
M. W. Lyon, Jr., in Proceedings of the United States National 
Museum. 
HyYLoBATES CONCOLOR redescribed as Hylobates miilleri albi- 
barbis. 
GEOGRAPHICAL DISTRIBUTION OF THE SPECIES. 
The Gibbons are essentially an Oriental Family the most western 
limit of any of the species being, according to Pemberton, the Hills or 
lower ranges of Bhutan where H. wnootock is found, and thence 
extends its range to Upper Assam, Sylhet Cachar, the Khasia and Garo 
Hills, Chittagong, Arakan, and south to Martaban, according to Ander- 
son, on the gulf of that name. In Upper Burma it also occurs in 
the defile of the Irawady below Bhamo, and also on the Kakhyen 
Hills on the eastern frontier of Yunnan. From the boundary between 
