204 PONGO 



marked "type" is quite different in shape. The facial region is very 

 sloping from the upper edge of the orbital ridge to the root of the 

 canines ; the rostrum is much longer, and the canine sockets lie at a 

 very different angle from those of the type ; the braincase is narrower 

 and higher posteriorly, and the occipital region is both broader and 

 higher. The two skulls are quite unlike, and serve to show of how 

 little value for specific distinctions are the cranial characters of these 

 Apes. 



The type of deliensis Selenka in the Munich Museum collected by 

 Dr. Martin, came from Kampong Stabat village on the north bank of 

 the Wampoo River in Langkat District, north east Sumatra. Two 

 specimens marked types. 



The type of 5. bicolor in the Paris Museum is barely half grown. 

 The face and under parts are very light while the upper parts of the 

 body and limbs are chestnut with light areas, such as those about the 

 shoulders, of a yellowish red. Four adult males in the United States 

 National Museum from Aru }3ay, east Sumatra, vary considerably 

 among themselves. The general color is a rich dark mahogany, some 

 with the limbs and whiskers almost ochraceous and this color is dis- 

 tributed without any regard to similarity or regularity. A large series 

 of females and young also exhibit the same individual variation in 

 coloration. These all probably are the same as P. s. bicolor the type 

 of which described above, has doubtless greatly faded. 



Measurements. Skull: total length, 224.1; occipito-nasal length, 

 165; Hensel, 169; intertemporal width, 64; zygomatic width, 162; 

 palatal length, 92.3; length of upper molar series, 62.6; length of 

 mandible, 191 ; length of lower molar series, 71.6. 



Aru Bay is close to Deli, and therefore these specimens must 

 be the same as P. s. deliensis of Selenka, though the above measure- 

 ments show a very differently proportioned skull from the type of 

 deliensis given above. But there is no especial significance in this, for 

 individual variation in the skulls of Ourangs is carried to so excessive 

 a degree, that a divergence from the typical form may be expected as 

 a matter of course. The surprise, if any existed, would arise if two 

 crania were found to resemble each other. P. s. obongensis Selenka 

 came from the vicinity of Mount Abongabong, northerly from Langkat, 

 northeast Sumatra. This is the same locality from which deliensis 

 came and therefore these two, and the Aru Bay examples are doubtless 

 all the same species. 



