■'^prcies nud Snl/.if)r<-ie.t of Monkeys. 2Ci5 



Cerco/nihecus stirticeps, sp. u. 



Type locality. N'dongo-leti, on the Upper Ubangui River, 

 Central Africa. 



Gen. char. No solid black on top of head or hind-neck, all 

 speckled. 



Colour, l^and of rather stiff hairs standing upright over 

 the eyes, black banded with white; top and sides of head, 

 back and sides of neck, upper parts of body Jiiid flanks 

 speckled buff and black ; chin and throit greyish white ; 

 nndcr parts smokc-grcy, apical half of hairs banded with 

 black and white ; tail at base speckled bufi' and black like 

 back, then for rest of ba^al half al) )vc sp 'cklcd black and 

 white, beneath at base black, faintly speckled with white, 

 rest of basal half paler, more of a brownish hue; apical half 

 above and beneath jot-black ; large white spot on nose. 



Mea.ttircmcnfs. Total length l.'Vl",') mm. ; tail 8ri0 ; foot 125. 

 No sknll. 



Ti/pe in the British Museum, no. 7. 7. 8. o. 



A single specimen obtained by the Alexander-Gosling 

 E.\pedition ; it differs markedly from C. nictitans in having 

 no solid black hairs on the head or neck, and in having 

 them speckled with buff and black instead of white and 

 black, and, in certain lights, in having a greenish tinge 

 on the dorsal region. The sex of the specimen is not 

 known. 



Cercopithecus ailaceus, sp. n. 



Type locality. South liankof the Loangwa River, Angoni- 

 land. Hritish Mast Africa. 



Geoyr. di.ttr. Loangwa River to Angola, West Africa. 



Gen. char. General hue yellowish green speckled with 

 black, and yellow on the flanks with distinct black 

 speckling. 



Colour. Greyish white brow-baud mixed with black on 

 hairs over nose and at each end ; hairs on forehead standing 

 upright, speckled with black and ta.vny, the latter being the 

 prevailing colour ; dorsal region from nape to tail speckled 

 black and buff-yellow, the black being equally prominent 

 with the lighter colour, especially on d;)rsal line from be- 

 tween shoulders and on lower l)ack and rump, making these 

 ])arts darker; back beneath shoulders on either siile of the 

 dorsal line, and flanks, buff-yellow, annulated and tipped 

 with brownish black, the lighier colour, however, predomi- 

 nating to the extent of giving all these parts a yellowish 

 apiearance ; shoulders darker than flanks, but not so dark a^ 



