PON GO 195 



Simla bicolor I. Geoff., Archiv. Mus. Hist. Nat., Paris, II, 1841, 



p. 526; Id. Cat. Primates, 1851, p. 6; Reichenb., VoUstand. 



Naturg. Aft'en, 1862, p. 182, figs. 455-457, t. ii, fig. 497. 

 Simla satyrus (nee Linn.), Gray. Cat. Monkeys, Lemurs and 



Fruit-eating Bats, Brit. Mus., 1870, p. 8. 

 Plthecus sumatranus dellensls Selenka, Sitzungsb. Akad. Wiss., 



Berlin, XVI, 1896, p. 386. 

 Plthecus sumatranus obogensis Selenka, Sitzungsb. Akad. Wiss., 



Berlin, XVI, 1896, p. 386. 

 Pongo pygmcEus bicolor Rothsch., Proc. Zool. Soc. Lond., II, 1904, 



pp. 437, 439. 

 Pongo pvgniccus abclii Rothsch., Proc. Zool. Soc. Lond., II, 1904, 



pp. 437, 439. 

 Type locality. Ramboom, near Touraman. N. W. coast of 

 Sumatra. 



Geogr. Dlstr. Borneo and Sumatra. 



Gent. Char. Hair dark mahogany to fox red, and frequently 

 with patches of ochraceous. 



The above is the synonymy, or the essential citations of the Bor- 

 nean and Sumatran Ourang-utans, and while of the opinion that there 

 is only one species of this great Ape, I have not been able to compare 

 sufficient material from the two islands to enable me to give a decided 

 opinion as to their identity. I can only state that I have been unable 

 to discover any character that would indicate they were distinct. The 

 crania of the Sumatran Ourang that I have seen, present the same 

 great individual variations that are so conspicuous in the Bornean 

 examples, and afford no character upon which to base a specific 

 difference from the Bornean Ourang or from among themselves, and 

 the color of the pelage exhibits much variation among specimens. I 

 have kept the synonymy separate in order to show what name each 

 would bear, should ample material, gathered in the future, prove they 

 were entitled to be considered distinct, which cannot be shown at the 

 present time. 



The following dimensions are taken from a Landak skull from 

 L^pper Merekai River, Landak-Sarawak District, Borneo : 



Measurements. Skull adult male, total length, 240 ; occipito-nasal 

 length, 167 ; intertemporal width, 59 ; breadth of braincase, 103 ; Hen- 

 sel, 182; zygomatic width. 174; extreme breadth of orbits, 112; width 

 of rostrum at canines, 77 ; palatal length, 93 ; length of upper canines, 

 33.6; length of upper molar series, 57.4; length of mandible, 184; 



