RUMIXANTIA. 281 



SUB- GENUS AIGOCEBUS. 

 PLATE XXI. 



Aigocerus Niger. 



WE place after A. leucophwa, or Blue Antelope, and 

 A. equina^ or Roan Antelope, the magnificent spe- 

 cies Aigocerus Niger of Captain Harris. Horns of 

 the male 37 inches over the curve, more slender than 

 in Leucophcea, more regularly curved, annulated 

 three-fourths of their length, with about 30 incom- 

 plete rings ; head elongated, muzzled, with whitish 

 marks down each side the chaffron ; neck and body 

 robust, deep ; withers elevated ; hoofs short, black, 

 obtuse ; hair short, close, intensely black, with 

 gleams of deep chestnut ; ears 10 inches, narrow, 

 pointed ; black standing mane, pointing rather for- 

 ward, extending to the middle of the back ; belly, 

 buttock, and inside of the thighs, white ; tail with 

 hair reaching the hocks ; stature, 4 feet 6 inches at 

 the shoulder ; 9 feet in length. Resides in the in- 

 terior of Caffraria, near the tropic of Capricorn, 

 where the species appears in the highlands, forming 

 small families. In the next, 



Sub-genus ORYX, Mr. Ru'ppel seems disposed to 

 place his A. beisa, ^n account of its similarity to the 



