530 On Cercocebus aterrimus and Cercocebus albigena. 



Mr. Lydekker, finally, mentions a specimen from Came- 

 roons which he believed to be C. albigena albigena. It has a 

 very long light brownish-grey mane, is scarcely darker 

 "between the shoulders, and the occipital crest is formed, to a 

 c onsiderable extent, of brownish hairs ; in fact, the longest 

 hairs of the crest are brownish grey. The thighs are tinged 

 with greyish brown, though they are not so distinctly differen- 

 tiated from the general colour as in C. a. albigena. On the 

 arms there is a number of light hairs and some with light 

 tips. The underside of the body is not brown as in the other 

 subspecies, but of a greyish tint. Mr. Pocock notes this 

 specimen in his monograph of the genus Cercocebus, but he 

 doubts its having come from the Cameroons. At the Berlin 

 Zoological Gardens I remember having seen some Mangabeys 

 of this kind which came from the Cameroons, and, like the 

 specimen in question, had a remarkably light mantle. I 

 think this form is a distinct local race of C. albigena ; but 

 before bestowing a name on it I want to see some more 

 material. 



The species of Mangabeys treated in this paper are 

 therefore : 



A. Cercocebus aterrimus, Oudemans. Hah. Central Congo 



Basin. 



Svn. Cercocebus eongicus, Scl. 

 C. hamlyni, Poc. 

 ('. albigena rothsehildi, Lyd. 



C. albiyena, Jentink. _ 



B. Cercocebus albigena, Gray. Distr. Cameroons to Uganda 



and Lake Mwei u. 



1. C. a. albigena, Gray. Hah. Lower Congo. 



2. C. a johnstoni, Lyd. Ilab. Upper Congo to Uganda 



and Lake Mweru. 



Syn. C. aterrimus, O. Neam. 

 C. jamrachi, Poc. 



3. C. a. subsp. Ilab. Cameroons. 

 Syn. C. a. albigena, Lyd. 



I may add that the only white monkey of the genus Cerco- 

 pithecus known to me is a male of C. osthiops, L., in the 

 Zoological Gardens, Frank furt-a./M. It has pinkish naked 

 parts, red eyes, but a blue scrotum. It has been figured by 

 the late Direktor Schoepf in the l Leipziger Illustrierte 

 Zeitung' (August 8th, 1907) under the name of C.albogularis. 



