1871.] DR. J. E. GRAY ON THK BUSH-BUCKS. 589 



drawings, I am inclined to think that a specimen of Seopophorus 

 (prohable S. montanus, which is found in W. Africa) was the origin 

 of his species. No species of Cephalophus, as yet observed, has 

 any knee-tufts. 



The species may be thus arranged geographically : — ■ 



West Africa. East Africa. South Africa. 



G. splendidula. Guinea. G. irrorata. Natal. G. nicfitans. 



G. campbdlice. S. Leone. T. alfifrons ? G. burchellii. 



Terpone longiccps. Ga- C 7 . nalalensis. Natal. C. pygmmus. 



boon. C. madoqua. Abyssinia. 



C. melanoprymnus. Ga- C. melatiorkeus? 



boon. C, bicolor. Natal. 



C. sylvicidtrix. S. Leone. 

 C. ogilbyi. Fernando Po, 



Gaboon. 

 C. badius. S. Leone. 

 C. rufilatus. Gambia. 

 C. dorsalis. S. Leone. 

 C. nigcr. Guinea. 

 C. nigrifrons. Gaboon. 

 C. coronatus. Gambia. 

 C. whitfieldii. Gambia. 

 C. maxwellii. 

 C. Tnelanorheus. 

 C. punctulahts. 



1. Grimmia. (The Duykers.) 



Horns elongate, more or less erect. Ears elongate, acute, covered 

 with short hair. Fur soft, with some under-fur. Skull elongate ; 

 nose compressed ; forehead flat, on the same plane as the nose ; 

 nasal oblong, elongate. (Peters, Mossamb. t. 41. f. 1, t. 42. f. 1, 

 skulls.) 



This genus appears to contain two groups of species, characterized 

 by the skull, as I pointed out in the * Catalogue of Ungulata in 

 the British Museum,' p. 78. The former group contains four 

 species, having different geographical distribution, and the latter at 

 present only one. 



The three species above referred to may be only geographic varia- 

 tions ; but Mr. Layard and other naturalists who have lived in 

 Africa assure me that they keep distinct, and they show no incli- 

 nation to change when bred in the Zoological Gardens (see P. Z. S. 

 1867, p. 277). 



* Head short; suborbital pit large, concave; intermaxillaries 

 reaching to the edge of the nasals; nose-hole moderate, sides 

 nearly parallel. 



1. Grimmia nictitans. (The Cape Duyker.) 



Cephalophus grimmia, Gray, Cat. Ungul. B. M, p. 78. 



Fur yellow-brown ; forehead yellowish bay ; nose blackish ; un- 

 derside of body rather paler. Young rather greyer. 

 Hub. South Africa : Cape of Good Hope. 



