54 Zoological Society/. 



January 23. — William Yarrell, Esq., Vice-President, in the Chair. 

 The following papers were read : — 



1. On some new or little-known species of Monkeys. 

 By John Edward Gray, Esq., F.R.S. etc. 



The older authors have described two species of White-nos6d Mon- 

 keys which liave been called Hocheurs by the French. 



In the British Museum we have specimens of each of these species, 

 and also of two very distinct kinds, which appear either not to have 

 occurred to preceding authors, or to have been confounded by them 

 with the species described by Erxleben. 



Cercopithecus melanogenys. The Black-cheeked Monkey. 



Dark olive, minutely yellow grisled ; face, cheek, forehead, chest 

 and hands black ; a lar2;e cordate spot on the nose and a small spot 

 on each temple white. Throat, under-part of the body and inside of 

 tlie legs whitish ; the front of the shoulders, outside of the limbs, end 

 of the tail blackish. Ears, the middle of the back, and upper part of 

 the tail, rufous. 



In the British Museum collection there is a half-grown specimen 

 of this species which died in a menagerie near London, and was said 

 to have come from Western Africa. 



The Black-cheeked Monkey is easily known from Cercopithecus 

 nlctitans by its yellow punctulated fur and cordate form of the spot 

 on the nose ; the latter character equally distinguishes it from Cerco'^ 

 pithecus petaurista, from which it is also separated by the blac'k- 

 ness of its cheeks and the greyness of the outside of the limbs, and the 

 redness of the middle of the back and the tail. 



This species was indicated in the * Annals of Natural History' for 

 1845, but is redescribed here for the purpose of comparison with 

 the next. 



<^ercopitiiecus ludio. The Ludio. 



Blackish, minutely yellow grisled ; face, temple, crown of the head, 

 shoulders and fore-legs, black ; outer side of the hinder legs and end 

 of tail blackish ; large oblong spot on the nose white ; throat, upper 

 part of the inside of arms, and lower side of the body, whitish ; rump 

 and under side of base of tail dark reddish brown. 



Hab. West Africa. 



In the British Museum there is a nearly full-grown specimen of this 

 species, which was procured from a menagerie in Liverpool, and was 

 said to have been brought from the west coast of Africa. 



This is at once known from two other species which have the fur 

 punctated with yellow, viz. C. petaurista and C. mela?iof/enys, hy the 

 large size and erect oblong form of the white spot on the nose, and 

 especially by the absence of any white on the cheek or temples ; it is 

 easily distinguished also by the general black tint of the fur, and 

 especially by the red hairs of the rump. 



In the course of last year there was exhibited in the Gardens of the 

 Society a short-tailed American monkey, which was regarded by several 



