1907.] MOXKEYS OF THE GENUS CERCOPITHECUS. 715 



Dr. Sclater, for example, applied the term "cinereovis" to tlie 

 belly, limbs, and tail, the tail being said to be blackish below. 

 The tail is, as a matter of fact, heavily speckled with grey 

 throughout the greater part of its length, being gi'eyer below than 

 above, except at the base and apex, and the limbs and belly show 

 no trace of grey speckling to account for the epithet " cinereous."' 

 According to Matschie there is a specimen of this Monkey from 

 Tschepo in the Tervueren Museum. 



Subsp, THOMASi Matschie. 



Cercopithecus thomasi Matschie, SB. Ges. nat. Fr. Berlin, 1905, 

 p. 262. 



So far as I can determine from the description, this form, to 

 which Matschie gives full specific rank, differs from the typical 

 form in being chestnut-red above, in having a much more distinct 

 band of greyish-white hair below the eyes, and in the extension 

 of the white on the chest to about the middle of the sternal area. 



Loc. East shore of Lake Kivu between Lakes Tanganyika and 

 Albert Edward. 



The ERYTHROGASTER-group. 



Cercopithegus erythrogaster Gray. (Plate XLI. fig. 4. 

 Text-fig. 185, p. 716.) 



Cercopithecus erythrogaster Gray, P. Z. S. 1866, p. 169, pi. xvi. ; 

 id. Cat. Monkeys Brit. Mus. p. 128, 1870 ; Murie, P. Z. S. 1866, 

 p. 380; Schlegel, Mus. Pays-Bas, vii. p. 69. 1876 ; P. L. Sclater, 

 P. Z. S. 1893, p. 252; Matschie, SB. Ges. nat. Fr. Berlin, 1893, 

 p. 226 ; Pousargues, Mem. Soc. Zool. Fr. vii. p. 71, 1894 ; Sclater, 

 P. Z. S. 1894, p. 1; Forbes, Monkeys, vol. ii. p. 46, 1894; 

 Pousargues, Bull. Mus. Paris, iii. p. 52, 1897. 



Skin of face round eyes bluish grey, lips and chin pinkish grey. 

 Nose clothed with black hairs, which, at least in some cases, appa- 

 rently turn white in the adult. Crown of the head speckled 

 golden green and encii'cled with a continuous black brow, temple, 

 and parieto- occipital strijDe. Below the temple-stripe a conspicuous 

 greyish-speckled patch close to the face, and beneath the latter a 

 smaller black patch near the corner of the mouth, which is con- 

 tinued backwards and upwards in the direction of the ear. The 

 area of the cheek below this and the throat covered with a thick 

 mass of longish white whiskei'S. The entire dorsal surface uni- 

 formly coloured blackish speckled with yellow, darker than the 

 head. Outer side of fore limbs with evanescent speckling, nearly 

 black ; hands blacker ; of hind limbs blackish grey but speckled ; 

 feet black. Upper side of tail like the back ; under side greyish 

 white ; chest and belly rusty brown ; inside of fore legs blackish 

 grey ; of hind legs greyish white. 



Loc. Lagos (sec. Pousargues). 



This species was based upon a young specimen showing no trace 

 of the white nasal patch characteristic, as was afterwards shown, 



