714 MU. R. I. POCOCK — A REVISION OF [Juiie 18, 



The L'HOESTI-group. 



This section, containing the single species C. Vhoesti, resembles 

 C. opisthostictus of the Leucampyx-section in the blackness of the 

 legs, shoulders, and belly, and in a lesser degree of the head. The 

 rufous dorsal area, on the other hand, recalls the Albogulai-is-group. 

 From the latter, however, as well as from all the species of the 

 Leucampyx-section, it differs entirely and resembles the typical 

 C. cethiops of the ^thiops-section in the upward direction and 

 snow-white colour of the longish cheek-hairs. The white throat 

 and whiskers, as well as the direction of growth of the lattei', and 

 the thickish clothing of black hair on the nose suggest affinity 

 with C. erythrogaster. 



Oercopithecus l'hoesti Sclater. 

 Subsp. l'hoesti Sclater. (Plate XLI. fig. 2.) 



Cercojnthecus Vhoesti P. L. Sclater, P. Z. S. 1898, p. 586, 

 pi. xlviii. ; Matschie, SB. Ges. nat. Fr. Berlin, 1905, pt. 10, 

 pp. 262-264. 



Face (dry skin) black ; nose thickl)', lips more sparsely clothed 

 with black hairs ; area of face below the eye clothed with a mixture 

 of short black and white hairs, which posteriorly become longer 

 and run up over the whiskers. The latter white, long, and 

 directed upwards and backwards to form a thick fringe between 

 the face and the ear, partially concealing that organ and continued 

 on to the sides of the neck behind it. The throat and posterior 

 half of the interramal area white like the cheeks, the white con- 

 tinued jjosteriorly in a narrow point as far back as the mamma). 

 Summit of head black, but the whole of its median area, like that 

 of the nape of the neck and the sides of the area between the 

 shoulders and the sides of the body above the belly, speckled wdth 

 greyish white. On the middle of the area between the shoulders 

 begins a band of hairs speckled black and orange-red, which 

 gradually expands posterioi-ly over the costal and lumbar regions 

 and dies away upon the hip and towards the root of the tail, the 

 orange-red in the hairs being in these places replaced by grey. 

 Tail for the most part grey speckled wdth black, its distal third 

 blacker, quite black at the end ; also about four inches of the 

 under side at the base black. The shoulder and fore limb, the hip 

 and the hind limb jet-black outside and inside. The entiie ventral 

 surface black with a tinge of brown from the clavicular region to 

 the anus, with exception of the above-mentioned white median 

 angular area on the fore part of the chest. 



Loc. Chepo or Tschepo in Congoland. 



A single adult 5 (type) from the above-mentioned locality, 

 which lived in the Societv's Collection from July 1898 to March 

 1902. 



Unless the specimen changed considerably in colour during 

 captivity, which is not impossible, the original description is inexact. 



