436 THE HON. WALTER ROTHSCHILD OK [DeC. 13, 



1763, and therefore, as the first acceptable generic name is Pongo, 

 we find that the name for the Oiungs as a group is Pongo 

 pygmceiis (Linn.). Now this animal of Linnfeus's is clearly shown 

 by the desciiption and Edwards's figure to have been a form 

 'withoict cheek-callosities, while we find in Schreber an ape, 

 entitled Simia agrias, which equally clearly is a young specimen 

 of a form loith cheek-callosities. But of neither of these forms 

 oi* phases have we any data which can satisfactorily determine 

 to what subspecies they belong ; therefore the names of these 

 two phases can only, I think, with any propriety, be applied to 

 the Landak- Sarawak form, and we arrive at the following 

 combination : — 



T, ■ f form, dimorph. pyc/mceus (without callosities). 



if ran ■> j^ torm. dimorph. agrias (with callosities). 



But because this three-legged appellation applies only to one 

 race of Orang-Outans, it is necessary to give names not only to 

 each of the three other subspecies as a whole, but also to each 

 dimorphic phase of each subspecies. ISTow Dr. Selenka called the 

 phase with cheek- callosities from the Landak region Pithecus 

 satyrns landakkensis, while he named the phase without cheek- 

 callosities P. satyrus tuakensis ; to these, however, I aj)ply the 

 names of Simia pygtnceus of Linnseus and S. agrias of Schrebei-, so 

 we get as the first Bornean subspecies of Pongo pygmcmis : — 



( form, dimorph. agrias (with cheek-callosities). 

 Pongo pygmaus I (Text-fig. 116, p. 437.) 



■pygnueus, | form, dimorph. injgmceus (without cheek-callo- 



[ sities). (Text-fig. 117, p. 438.) 



The phase with cheek- callosities from the Batangtu region was 

 named Pithecus satyrus batangtueiisis by Dr. Selenka, while he 

 named the phase without cheek-callosities P. satyrus skalauensis ; 

 of these, one had, however, been described previously under the 

 name of Simia ivurmhii E. Geoff. ; thei-efore the second Bornean 

 subspecies must stand as follows ; — 



p r form, dimorph. lout^mbii (with cheek-callosities). 



■^ ■^■/v. \ form, dimorph. shalauensis (without cheek- 



tvurmmi, n v \ 



' [ callosities). 



Dr. Selenka has called the phase with cheek-callosities from the 

 Dadap-Genepai region Pithecus satyrus dadap2)ensis, while he 

 gave the name P. satyrus genepaiensis to the phase without cheek- 

 callosities from the same i-egion ; therefoi'e the third Bornean 

 subspecies must stand thus : — 



f form, dimorph. dadappensis (with cheek-oallo- 

 Pongo pygracBus J sities). 



dadappensis, j form, dimorph. genepaiensis (without cheek- 

 [ callosities). 



The Sumatran Orang with cheek-callosities had the name of 



