the Genus Ccrcoccbus. 285 



the evitlciico, bo adniitted as tlio lopresentative of a distinct 

 form. 



9. Sclater's Mangabey. 



Cercocebus congicus, Sclater. 



Cercocehns congiciis, Sclater, P. Z. S. 1899, pp. 827-828, fig. 



The diagnosis runs as follows: — "Niger, subtiis nudi- 

 iiRculus, crista extanto longa nigra : genaruni pilis productis 

 albis : manibus ct pedibus cum facie carneis : mento et pectore 

 albis, ventre nigricanfe, tibiis albis : brachiis nigris, caudS, 

 albicante. Long. corp. 2, caudre 3, tota 5 ped. Angl. 



''Ilah. Terra Congica/^ 



This species was based upon a single female specimen 

 living in the Antwerp Gardens and believed to have come 

 from the district of {Stanley Falls on the Upper Congo. 



The reproduced photograph published by L)r. Sclater shows 

 that the crest on the head was long and rose nearly vertically 

 from the crown like a column, presenting an appearance 

 quite unlike that of the crest of (J. albigetia or C. llainlyni. 



10. Hamlyn's Mangabey. 



Cercocebus Hamlynij Pocock. 



Cercocebus Hamlyni, Pocock, Aun. & IViag. Nat. Hist. 1906, xviii. 

 p. 208, pi. vii. 



Loc. Congo : exact locality unknown. 



Key to the Species and Subspecies, showing their apparent 

 Affinity . 



a. No upstanding tuft of hair on the posterior por- 

 tion of the crown of the head. 

 h. Hairs on body a uniforna blackish grey or 

 nearly black, not annulated. 

 c. No distinct white collar ; summit of head not 

 red-brown. 

 (/. No white patch on summit of head ; lower 



surface slaty grey fuUginosus. 



d\ A white patch on summit of head ; lower 



surface whitish Iu7iulutus. 



c^. A white band extending on each side from 

 the eye beneath the ear on to the back of 

 the head and continued down the nape of 



the neck ; top of head red-brown cethiopicus. 



b^. Hairs, at least on the head, fore limbs, and 



fore part of the body, distally annulated with 



yellow, giving a speckled appearance to the 



coat. 



e. No parting in the hairs on the forehead to 



form a brow-fringe ; throat and inner side 



of limbs yellow like chest aud belly cltrysogaster. 



