1907.] ON NEW ANTELOPES AND SHEEP. 237 



March 5, 1907. 

 Frederick Gillett, Esq., Vice-President, in the Chair. 



The Hon. Walter Eothschild, M.P., F.Z.S., exhibited a mounted 

 specimen of a Gorilla, Gorilla gorilla diehli. 



The following papers wei'e read : — 



1. Descriptions o£ a new Species and two new Subspecies ol: 

 Antelopes and a new Sheep,. By the Hon, Walter 

 ROTHHCHILD, M.P., Ph.D., F.Z.S. 



[Received March 3, 1907.] 

 E.HAPHICEKOS HORSTOCKI NATALEXSIS, Subsp. n. 



Differs from R. horstocki in its much darker colour. The white 

 patches on the throat and round the eyes mucli smaller and the 

 white on the belly less extended. The whole of the rest of body, 

 head, and limbs dark vinaceous rufous instead of orange -rufous. 



Hah. Neighbourhood of Drakensberg, ISTatal. 



Oervicapra arundineum oocidentalis, subsp. n. 



Differs fi-om G. arundineum in the paler, more greyish rufous 

 of head and neck and the pale rusty-grey of limbs, tail, and body. 

 The horns also seem straighter and thicker as a rule. 



Hah. JSTeighbourhood of Fort Jameson, Northei'n Rhodesia, and 

 Bangweolo Flats. 



COBUS ROBERTSI, Sp. n. 



I am treating this as a species because it occurs in the same 

 territory as true G. lechim and G. smithemanni, otherwise it has 

 many characters intermediate between these two species. Nor 

 do I consider it likely that it is a hybrid, for it has been shot by 

 several sportsmen, and not always in the same localities. 



Horns stouter and the rings broader and closer together than 

 in G. lechioe, smooth tip shorter. Head, hind-neck, body, and 

 upper part of fore-neck bright orange-rufous, back and flanks 

 darker and redder than in G. leckwe. Cheeks, throat, and sides 

 of neck have the rufous strongly mixed with black hairs, thns 

 somewhat approaching G. smithemanni. Lower fore-neck whitish, 

 with two large black patches on each side, which join similar 

 patches on the front of the shoulders. Outside of ears rafous 

 buff, inner side white. 



Hab. Northern Rhodesia. (Type, collected by Mr. Roberts.) 

 Proc. Zool. Soc— 1907, No. XVIL ] 7 



