202 DR. J. E. GRAY ON TWO NEW MAMMALS. [Apr. 10, 



Notice of an Ape (Macacus inornatus) and a Bushbock 

 (Cephalophus breviceps) in the Gardens of the Society. 

 By Dr. John Edward Gray, F.R.S., V.P.Z.S., F.L.S. 



(Plates XIX., XX.) 



When I was at the Gardens the other day I observed an Ape and 

 a Bushbock that I had not before seen, I have therefore sent a 

 short note on them that they may be inserted in the Systematic 

 Catalogue. 



The Ape is a species of Macacus, which was purchased of the wife 

 of a sailor, who had brought it from Borneo ; so we may conclude 

 that it is probably a native of that country. It differs from all the 

 other species of this genus in the dark uniform colour of the fur, the 

 very short rudimentary tail, and the large naked space that sur- 

 rounds the callosities on the buttocks. This naked part is bright red 

 in the living animal, and is shown when the animal sits on its 

 haunches.. The naked space is divided above into two parts by a 

 narrow streak of fur that commences from the back and is continued 

 to the base of the tail. . 



The animal is so peculiar that it may be formed into a section of 

 the genus under the name of Gymnopyga. 



Macacus inornatus. (PI. XIX.) 



The tail rudimentary, scarcely to be distinguished. Buttocks 

 callous, surrounded by a large naked red space, which is interrupted 

 above by a narrow hairy streak to the base of the tail. Face and ears 

 naked, black ; nose flat. Head covered with hair regularly directed 

 backwards ; the hair of the hinder part of the head rather elongate, 

 not forming any crest. Fur blackish brown, nearly uniform. Hair 

 soft, one-coloured ; forehead, frontal band, and hands black ; the 

 hinder part of the thigh greyish white. 



Hab. Borneo ? A female, not full-grown. 



This species is distinct from Macacus arctoides of Isidore Geoffroy, 

 as that species has a red face, and comes from Cochin China. It 

 agrees in some respects with the description of Macacus maurus of 

 M. F. Cuvier ; but M. Isidore Geoffroy (Cat. Mamm. p. 31) observes 

 that M. F. Cuvier's figure is only derived from a drawiug, and is a 

 very doubtful species. 



The Bushbock was obtained from the west coast of Africa. It 

 belongs to the section of the genus which have short, nearly erect, 

 horns situated on the hinder part of the forehead. It is peculiar for 

 the short broad form of the head. The cheek-groove is well deve- 

 loped. The animal is not full-grown, and the usual frontal tuft is 

 scarcely developed. 



Cephalophus breviceps. (PI. XX.) 



The head short, broad, thick; the horns. short, thick, conical, 



