ae T — 
i} : 
Lia. 
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 S. 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 Bay, 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 deliensts 
came and therefore these two, and the Aru Bay examples are doubtless 
all the same species. 
