454 On a new Species of Mangabey, 



LXXr. — Description of a Second new Species of Mangahey 

 (Cercocebus Jamiaclii). J3y R. I. POCOCK, F.L.S., F.Z.S., 

 Superintendent of the Zoological Society^s Gardens. 



[Plate XL] 



The young male monkey upon which this new species is 

 based was deposited in the Zoological Gardens by Mr. Roth- 

 schild, who has placed its determination and description in 

 my hands. I propose to name it after Mr. Albert E. Jamrach, 

 the well-known importer of wild animals, who procured the 

 specimen. 



Cercocebus Jamrachi, sp. n. (PI. XI.) 



The face, ears, palms of the hands, and soles of the feet 

 flesh-coloured, the face much more pallid than tlie hands and 

 feet, which are of a decided rosy ])ink ; one or two small asym- 

 metrically disposed pigment-spots on the face and ears. The 

 iris of the eyes olive-brown ; the white of the eye with a 

 faint grey-blue tinge. Tiie hair everywhere a uniform dirty 

 white. On the posterior portion of the crown of the head 

 the hair is thick and long, forming an occipito-parietal tuft 

 as in C. Hamlyni * ; it is also long behind the ears, but on 

 the cheeks it is quite short and sparse, whereas on the brow 

 there is a scanty and shaggy fringe of long, semierect, and 

 partially porrect hairs. 



Length from the crown ol" the head to the root of the tail 

 12 English inches ( = 300 mm.) ; length of the tail 19 inches 

 ( = 475 mm.). 



Loc. Molinga (PMlungu), Lake ^Iweru. 



The great interest attaching to this monkey lies in its 

 remarkable coloration, which is unique in the genus Cerco- 

 cebus. That the specimen is not a true and complete albino 

 is shown by the normal tint of the eyes. It may be an 

 albinescent variety of some species of Cercocebus, but of this 

 there is as yet no proof. In the paper containing the description 

 of C. llumlyni 1 have discussed the possibility of the types of 

 that species and of C. conyicus being partially albino sports 

 of C. albiyena Rot/ischildi or an allied species. The reasons 

 therein given for dismissing the hypothesis of albinism a{)ply 

 also to the present case, except for the total absence in this 

 species of pattern showing symmetrical arrangement. More- 

 over, C. Jamrachi differs from the three forms just named 

 • Ann. & May. Nat. Hist. (7) .wiii. pp. J08 JlO, pi. vii. (llK)0). 



