PON GO 191 



From Sumatra his material was much less extensive, and all 

 of it was obtained from the Langkat District. He recognized 

 one species Pithecus sumatranus, and two races, P. s. deliensis, 

 and P. s. obongensis. At present the writer considers all these 

 the same as Pongo pygm^us, the material thus far obtained 

 not being sufficient for establishing distinct forms, the variations 

 existing both in the color of the fur, and in the crania, even 

 in individuals from the same locality, being too great to permit 

 the selection of any specimen as possibly representing a distinct 

 form. Like Bornean examples, some old males possess 

 cheek callosities, others, equally old, not having them. But if 

 at some later day more ample material proves that the Sumatran 

 Ourang is distinct from the Bornean, then these races and 

 species named by Selenka must be known as Pongo abelii 

 (Clarke). 



1898. Selenka, Studien uber Entwickelungsgeschichte der Tier, 

 Sechstes Heft, Menschenaffen. 



The various races given in the previous paper are here re- 

 peated, and their distinction is attempted by the cubical dimen- 

 sions of the braincase, which cannot be said either to be 

 satisfactory or in any way final ; variation both in the size and 

 shape of the braincase being too great among individuals ever 

 to permit this method to be accepted as conclusive. 



1898. Selenka, Studien uber Entwickelungsgeschichte der Tier, Sie- 

 bentes Heft, Menschenaffen. 



In this paper comparison is made of the capacity of the brain- 

 case, and the shape and size of the teeth of the Ourang, 

 Gorilla, and Chimpanzee. No species or races in either of the 

 genera are predicated upon the differences observable. 



1904. W. Rothschild, in Proceedings of the Zoological Society of 

 London. 



In this paper, after some remarks upon the contributions of 

 Messrs. Matschie and Selenka to our knowledge of the Great 

 Apes, the Author presents his view regarding the specific 

 status of Ourangs. While considering the presence or absence 

 of the cheek callosities to be dimorphic, and not indicating a 

 distinct form, he, nevertheless, confers names upon these acci- 

 dents of nature, and thus creates them subspecies, a conclusion 

 not likely to be seriously entertained or adopted. One species 



