280 Mr. R. I. Pocock on 



Loc. Gold Coast. 



In Trouessart's Catalogue (1904) and, I believe, in all 

 previous literature this species figured as cethiops, Linn. ; but 

 since, as Mr. deWinton pointed out, this name was originally- 

 given to a si)ecies of the genus Cercopitl/fcus, it cannot 

 stand for the mangabey in question, for which lunulatus 

 seems to be the correct title. 



3. The White-collared Mangabey. 



Cercocehus cfifhiopicu.t, F. Cuv. 



Cercopithecus (Bthiopicus, F. Cuvier, Mamm. ii. livr. xxxv. (1821). 

 Cercocebus collar is, Gray, List Mamm. Brit. Mu3. p. 7 (184-3) : and of 

 subsequent authors. 



].oc. Nigeria, Cameroons, and French Congo. 



Although this species is usually known by the appropriate 

 title " coUaris^" the oldest available name seems to be 

 (Bthiopicus. 



4. The Yellow-bellied Mangabey. 



Cercocebus chrysogaster, Lydd. 

 Cercocebus chrysogaster, Lydekker, Novit. Zool. vii. p. 279, pi. iii. (1900). 



Loc. Congo : exact area unknown. 



1 have seen a few living specimens of this species, but 

 Mr. Rothschild has kindly afforded me the opportunity of 

 examining the type, whicli lived for about one year in the 

 Zoological Gardens. This may account for certain discrep- 

 ancies between the description and the s[)ecimen. Between 

 the drawing up of the description which was published on 

 Aug. 20th, 19U0, and the death of the specimen in February 

 1901 certain colour-changes must presumably have taken 

 place in the hair, tor it is asserted that the s[)eckling disappears 

 on the flanks and outer sides of the limbs, whicii tend to 

 slate-grey, and that the inner surface of the limbs is rather 

 paler than the outer surface. In the specimen at the present 

 time the flanks and outer sides of the limbs down to the 

 hands and feet are distinctly speckled, though not so strongly 

 as the head and back, and the inner surface of the limbs is 

 orange like the lower surface of the head and bod}', though 

 paler. The describer's statement that this species ditfors 

 from all other species of Cercocebus as M'ell as from all species 

 of Cercopithecus in the bright orange coloration of the under 

 surface was made in forgetiulness of the fact that Pousargues 

 had already ascribed a similar coloration to tlie belly of 



