694 MR. K. I. rococK — a rkvisiok of [June 18, 



Bi'ow-band not sharply differentiated from summit of head, 

 which, like the nape, although blackish, is speckled with yellowish 

 grey. Anterior hairs of brow-band darker than in G. I. stiohlmcmoii ; ' 

 no black j^atch of hair in fi-ont of the ear. Shotilders black but 

 speckled with grey, at least in the middle hue. Dorsal and lateral 

 areas of body speckled gi'eyish yellow, uniformly tinted ; tail 

 speckled only at the base, the I'est black. Fore legs jet-black ; 

 hind legs also jet-black, and sharply defined from the sacral 

 region. Belly jet-black, not speckled. Throat, lips, and chin 

 white, a smudge of black defining the white of the lips. Head 

 and body 600 mm., tail 700 mm. 



Zoc. Southern Abyssinia to Lake Rudolf. 



The above-given description is taken from an adult specimen 

 in the Biitish Museum obtained in the Oharada Forest, Kafia 

 (600 ft. alt.), by Mr. W, N. Macmillan. GigHolrs type also came 

 from Kaffa. Sclatei- I'ecords another specimen in the Florence 

 Museum from Abugifar in Grimma, province of Gojam. The type 

 of C omensis, a young animal, was from the Omo River, which 

 flows southwards into the northern extremity of Lake Rudolf. 



This form, species or subspecies, is obviously more nearly 

 related to C. leucamj^yx than to C. cdbogularis, with which Gigiioli, 

 Sclater, and Forbes compared it. This mistake as to its affinities 

 may have misled Thomas into describing the type of C. omensis 

 as a new species. 



Cbrcopitheous opisthostictus Sclater. 



Cercopithecus opisthostictus P. L. Sclater, P. Z. S. 1893, p. 725. 



Skin of face dark, upper lip scantily clothed with white hairs ; 

 lower lip, chin, and throat white. LTjDper surface of the head and 

 nape greyish black, the black predominating, the two pale annuli 

 on the hairs much narrower than the intervening black spaces ; 

 on the anterior part of the forehead, however, the grey pre- 

 dominates, as also on the cheeks and sides of the neck, which ai-e 

 decidedly paler than the crown and nape. Area between shoulders 

 blackish, the grey annuli being veiy narrow. Shoulders and ai-ms 

 black. Thoracic, lumbar, and sacral regions of body and root of tail 

 speckled, the hairs with four or five grey annuli, which for the 

 most part exceed the black spaces in width. Ventral surface 

 jet-black from the anterior extremity of the chest to the pubic 

 region. Legs black externally from the hip to the foot, grey, but 

 not so gi'ey as the back, internally. Tail greyish in its basal 

 third, becoming gradually blacker, almost its distal two-thiids 

 jet-black. Sometimes, but not always, there is a reddish-brown 

 patch on each side near the root of the tail. 



Length from crown of head to root of tail 525 mm., of tail 

 700 mm. 



Loc. Region of Lake Mweru. 



I have seen four specimens of this species. The two flat 



