HYLOBATES 153 



LEUCOGENYS ; H. HooLOCK ; H. raiResi = H. agilis ; H. agilis ; 

 and H. leuciscus. 



1876. Pousargues, in Bulletin du Museum d'Histoire Naturelle, Paris. 

 Hylobates henrici first described. 



1876. Schlegel, in Museum des Pays-Bas, Simice. 



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. AGILIS ; H. LEUCISCUS ; H. 



CONCOLOR ; H. miilleri = H. concolor. 



1884. Kiinckel, in Sciences Naturelles, Paris. 

 Hylobates nasutus first described. 



1878. 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. hoolock ; H. lar, with pale variety H. en- 

 telloides; H. funereus ex Sulu as a synonym. H. agilis ; H. 

 syndactylus, belonging to the genus Symphalangus ; H. fus- 

 cus ; and H. concolor Harlan. 



1892. Thomas, in Annals and Magazine of Natural History. 

 Hylobates nasutus redescribed as H. hainanus. 



1909. Thomas, in Annals and Magazine of Natural History. 

 Hylobates gabrielli first described. 



1911. M. W. Lyon, Jr., in Proceedings of the United States National 

 Museum. 



Hylobates 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. hoolock 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 



