566 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIIl. 



The two skulls from the Sakaiam River are almost exactly alike 

 and show no appreciable differences from skulls of Macaca nemes- 

 trina from Sumatra. See table of measurements below, and the 

 measurements given by Mr. Miller, place cited, page 562. The skull 

 from the Landak River more nearl}^ resembles the type skull of 

 Macaca hroca Miller (page 558, place cited), but the zygomatic width 

 is not as great (see table below), and the angle of the plane of the 

 orbits with the plane of the nasals is not so well marked. In many 

 ways the Landak skull is an intermediate between the type skull of 

 Macaca hroca and the Sakaiam skull or skulls from Sumatra, but rather 

 nearer the Macaca hroca type. It is possible that more than one form 

 of the Macaca nemestrina group should occur in Borneo, but at present 

 specimens are too few to determine this fact satisfactorily or to 

 map out their ranges. For the present it seems best to consider the 

 three skulls from western Borneo as being Macaca nemestrina, or 

 very near that, and still consider that Macaca hroca Miller, from 

 northern Borneo, is a well-marked form. 



It may be noted in this connection that the description of the color 

 of Macaca hroca, quoted by Mr. Miller from Hose's Mammals of Borneo, 

 was not written by Mr. Hose, but copied by that author verbatim 

 from the account of Macaca nemestrina as written by Anderson in 

 his Western Yunnan Report m 1878. Many of Hose's descriptions 

 seem to have been taken from earlier writers, such as Anderson and 

 Blanford. 



[On one occasion, at Sintass, a Dyak Kampong away up the Sakaiam 

 River, near Sarawak frontier, I saw 21 broks {Macaca nemestrina), 

 all brought in together one evening and eaten. A drove was sur- 

 rounded in a clearing, and all killed. — W. L. Abbott.] 



Measurements of five skulls hclonging to adult males of the Macaca nemestrina group. 



«This measurement in Cat. No. 123143 U.S. N.M. from Kateman River, Sumatra, is only 56 mm. a 

 trifle less than in the two flat-headed Bomean skulls. 



