258 CERCOCEB US 



1900. Lydekker, in Novitates Zoologicce. 



Cercocebus chrysogaster ; C. hagenbecki ; C. albigena john- 

 stoni, first described ; and C. aterrimus redescribed as C. a. 

 rothschildi. 



1906. Pocock, in Annals and Magazine of Natural History. 



Cercocebus aterrimus redescribed as C. hamlyni, and Cer- 

 cocebus a. johnstoni redescribed as C. jamrachi; and in a sub- 

 sequent paper he reviews the species of the genus, recognizing 

 ten with three doubtful. They are: C. fuliginosus = C. 

 .ffiTHiops (Schreb.) ; C. lunulatus; C. cethiopicus (Cuv.), = 

 C. TORQUATUS (Kerr) ; C. chrysogaster; C. hagenbecki; C. 

 AGiLis ; C. galeritus ; C. albigena, with aterrimus rothschildi, 

 and a. johnstoni, somewhat doubtful. C. congicus and C. 

 hamlyni both = C. aterrimus. 



1910. E. Schwarz, in Annals and Magazine of Natural Histoj-y. 



A paper on C. aterrimus and C. albigena and their synonyms. 

 The Author discusses the specific values of C. congicus, C. 

 hamlyni, and C. rothschildi, and decides that they are merely 

 albinistic individuals of C. aterrimus Oudemans, as regards 

 the first two, and the third is not to be distinguished from the 

 same species. Also C. jamrachi is an albino of C. a. johnstoni. 

 C. albigena and C. aterrimus are compared and their 

 specific diflterences shown. 



1911. Schwarz, in Sitzungsberichte der Gesellschaft Naturforschender 

 Freunde, Berlin. 



Cercocebus albigena zenkeri first described. 



GEOGRAPHICAL DISTRIBUTION OF THE SPECIES AND SUBSPECIES. 



The species of the genus Cercocebus are African and so far as 

 is known are about equally divided between the eastern and western 

 parts of the continent. In East Africa the most northerly species 

 is C. galeritus, which is found in the vicinity of the Tana River, its 

 range, like those of many of its relatives not yet determined. From 

 Uganda and Lake Mweru to the Upper Congo C. a. johnstoni is met' 

 with. In various places along the Congo, the exact localities yet to 

 be ascertained, the following species have been procured. C. chryso- 

 gaster on the "Congo" ; C. hagenbecki, locality given as "Upper 

 Congo"; C. albigena "Lower Congo"; C. a. senkeri, at Bifindi, 

 Cameroon; and C. aterrimus, "Central Congo Basin." In Nigeria C. 

 TORQUATUS is met with ranging south and east through Cameroon into 



