DUIKERS AND SMALL ANTELOPES 543 



bush duikers, but serves as a barrier to their migration 

 downward to the plains, which are inhabited by another 

 closely allied race, hindei. We have the same conditions 

 duplicated on Mount Kenia, the same race of high moun- 

 tain duikers, altivallis, inhabiting the moorland down to 

 the beginning of the dense bamboo and forest zone which 

 absolutely limits their lower vertical range and keeps them 

 apart from their close allies of the plains below. 



The dorsal coloration is ochraceous-tawny, heavily 

 lined by black, the latter predominating and giving a 

 Front's brown general effect, the hair basally being 

 broccoli-brown. The rump is somewhat grayer than the 

 back. The sides of the body and the neck are tawny-olive, 

 the color merging gradually into the white under-parts. The 

 neck and the sides are without black vermiculation. The top 

 of the head is bright cinnamon-rufous, with a broad median 

 band of black from the rhinarium to the coronal tuft ; the tuft, 

 however, is chiefly cinnamon-rufous. The sides of the face 

 are lighter or cinnamon. The under-parts are white, the 

 hair basally being ecru-drab. The chest is mixed with fawn 

 centrally. The lower throat is tawny-olive, like the sides. 

 The throat and the median line of the chin and the upper lips 

 are white, but the sides of the chin are seal-brown, in marked 

 contrast. The hind legs are vermiculated with black, like the 

 rump. The pastern region above the hoofs is seal-brown, 

 which is continued a few inches above as a faint streak. 

 The forelegs are vermiculated with black, like the hind, 

 and the seal-brown of the pasterns is more extensive and 

 extends up the front of the limbs nearly to the shoulders. 

 The ears are clothed by short tawny hairs on the outside 

 and inside with long white hair. 



Four specimens, two males and two females, of this 

 race, from the summit of the Aberdare Range, have been 

 examined at the National Museum. The larger male speci- 

 men measured in the flesh: head and body, 34 inches; tail, 

 4 inches; hind foot, 10^ inches; ear, 4^ inches. Length 

 of skull, Gyi inches. The horns of this specimen measured 

 4^ inches in length by i^ inches in spread at the tips. 

 The two female specimens are slightly larger than these 

 dimensions. 



