COLOUR AND PECULIARITIES 



instead of the usual three, pre-molar teeth in the lower 

 jaw. The face glands situated just below the eyes 

 were remarkably developed in all the specimens I 

 shot, and the pits in the skull corresponding to them, 

 though shallow, are large (43 mm. in diam.). The 

 glands are surrounded by white hairs, and the central 

 cavities (which are on an average 7-5 mm, in diameter) 

 exude a thick, dark-coloured excretion. 



This species is of a uniform pale cafe-au-lait colour, 

 the cows being somewhat lighter than the bulls. The 

 latter often become slaty grey towards the end of their 

 lives, in this respect being similar to the eland ( Tauro- 

 tragus oryx). On the face they have a white chevron, 

 joining the two white patches round the eyes. The 

 inner surfaces of the ears, the belly (in Jubaland 

 specimens at any rate) and the tail are also white. 

 The latter is about 18 inches in length, the lower part 

 being sparsely covered with coarse white hairs. 



There is one peculiarity in the arrola that I have 

 not seen mentioned anywhere, nor have I noticed it in 

 any other antelope ; they have a large roll of loose 

 skin underlaid with fat, situated just behind the horns 

 across the skull between the ears and horns. This is 

 a very marked feature, and it is more developed in 

 the male than in the female ; moreover, it is especially 

 noticeable when the animals are in good condition. 

 What purpose this may serve, I am quite at a loss to 

 say. 



I questioned the natives very carefully as regards 

 their range, and I have come to the conclusion that 

 they are not found west of longitude 40° E,, or north 

 of latitude 0° 35' S, They do not inhabit the country 

 south of the Tana River nor the district immediately 

 adjacent to the coast, I was much puzzled and 

 G 97 



