1906.] ON ANTHROPOID APES. 465 



1. Further Notes on Anthropoid Apes. 

 By the Hon. Walter Eothschild, Ph.D., F.Z.S. 



[Received May 1, 1906.] 



Since my former paper (P. Z. S. 1904, vol. ii. pp. 413-440) was 

 read, I haA'e obtained a coDsiderable amount of fresh material 

 inchiding skins, skeletons, and skulls of Gorilla, Simia, and Pongo. 

 I propose, however, here to deal only with a few facts, corrections, 

 and additions in connection with the genera Gorilla and Simia. 



I have received seveiul fresh skulls of Gorilla gorilla matschiei 

 from the Camaroons collected by Mr. Bates, and they fully confirm 

 both the distinctness of this geographical race and my diagnostic 

 characters. A point in connection with these Gorillas I omitted 

 to mention in my original article is that both Gorilla gorilla 

 from Gaboon and Gorilla gorilla matschiei from S. Camaroons have 

 individuals with red heads and others with dark heads with no 

 red. In the case of the typical Gaboon Gorilla gorilla the red- 

 headed individuals outnumber the dark ones by 4 to 1, but of the 

 S. Camaroons race, although we have a large number of skulls, the 

 skins are too few to enable me to gauge the proportion. 



In Gorilla gorilla the dark-headed specimens have the head 

 of a bro^vnish-olive colour, while in G. g. matschiei the dark- 

 headed individuals have a rufous-brown head . A striking difference 

 between red-headed specimens of G. gorilla and G. g. matschiei is 

 that in the former the red colour is sharply defined, while in the 

 latter the brown forehead passes gradually into a deep rufous red 

 on the crown and occiput. 



In a former collection Mr. Bates sent a skull of Professor 

 Matschie's G. gorilla diehli and in his last collection is a not very- 

 perfect skin of this race of Gorilla. As Prof. Matschie described 

 the race from skulls only, this specimen completes the diagnosis. 



Gorilla gorilla diehli Matschie. 



Differs from the dark-headed specimens of other races in having 

 the head almost entirely black, only the forehead having a few 

 brown hairs. Bla,ck colour of arms and shoulders very intense. 

 Back, belly, legs, and chest ashy grey, but darker than in G. gorilla 

 and G. g. matschiei. Beard on chin much longer than in G. g. 

 onatschiei, thus proving that G. heringeri of Kirunga is only a local 

 race of G. gorilla and not a distinct sjpecies ; the latter must stand 

 as Gorilla gorilla heringeri Matschie. Beard on sides of face black, 

 instead of yellowish grey as in G. g. matschiei or ashy grey as in 

 G. gorilla. 



Professor Matschie has recently described (Sitzungsb. natur- 

 forsch. Pr. Berl. Nr. 10, pp. 279-283, 1905), under the name of 

 Gorilla jacobi, another race of Gorilla gorilla. The type came from 

 the station at the mouth of the Lobo River, near the influx of the 

 River Djong, in the Dscha river-system. West Central Camaroons. 

 The characters given depend on the immensely broad bones of the 



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