Ixxii INTRODUCTION 



Region; and go as far as Tonkin and eastern Thibet. They are 

 R. roxellaNvE; R. bieti ; R. berlichi, and R. avunculus. Simias 

 and Nasalis each with a single species are natives of the islands 

 of South Pagi and Borneo respectively of the Indo-Malayan 

 Subregion of the Oriental Region. Colobus is a genus of the 

 Ethiopian Region its members being entirely restricted to the 

 Continent of Africa, the greatest number of species dwelling in 

 the East African Subregion, and ranging from Abyssinia to Nyassa- 

 land and from Gambia to Angola. In the East African Subregion 

 fifteen species are found, which, beginning with the most northern 

 are as follows: C. abyssinicus ; C. tolyurus; C. gallarum ; C. 



ELLIOTI ; C. TEPHROSCELES ; C. RUWENZORI ; C. CAUDATUS ) C. RUFOMI- 

 TRATUS ; C. PALLIATUS ; C. KIRKI ; C. GRAUERI ; C. SHARPEI ; C. 



GODONORUM ; and C. angolensis. In the West African Subregion are 

 C. BouviERi ; C. fuliginosus ; C. vellerosus ; C. satanas ; C. ferru- 

 GiNEUs; C. rufo-niger; C. verus; C. a. occidentalis ; C. preussi ; C. 

 POLY'coMus; and C. pennanti. Four species are found in Central 

 Africa, and C. temmincki's habitat is unknown. 



Hylobates or Gibbons are natives of two of the recognized 

 Zoogeographical Regions, the Indian and the Oriental. Of the first 

 of these in the Indo-Chinese Subregion are H. hoolock ; H. lar ; H. 

 leucogenys; H. gabrielli; H. henrici; H. pileatus; and H. 

 NASUTUS. In the Indo-Malayan Subregion are H. lar ; H. agilis ; 

 H. LEUciscus ; H. concolor ; H. funereus ; and H. fuscus ; the last 

 two being of doubtful validity. The other genus of Gibbons Sympha- 

 langus has S. syndactylis, with one rather doubtful subspecies, ^. 

 s. continentis; and S. klossi ; all in the Indo-Malay Subregion of the 

 Indian Region. We now reach the Pongiid^ containing the great 

 Apes, the remaining members of the Primates. Pongo the first genus 

 has one species, P. pygm^us, (a second being doubtfully possible P. 

 abelii,) from the great islands of Borneo and Sumatra in the Indo- 

 Malay Subregion of the Indian Region. The second genus Gorilla 

 has all its members save one in the West African Subregion of the 

 Ethiopian Region. These are G. gorilla; G. g. castanciceps: G. g. 

 matschie; G. g. jacobi; and G. g. diehli. In the East African Sub- 

 region G. eeringeri is found in the German Protectorate, in all, two 

 species and four subspecies. Of the majority of these it must be said 

 that they are very doubtfully separable from G. gorilla, all the 

 knowledge we have of them having been gathered from very insufficient 

 material. 



