NILGALI 303 
Head of Nilgai. 
The NILGAI or BLUE BULL (Boselaphus tragocamelus). 
This ungainly and small-horned antelope is an Asiatic repre- 
sentative of a group whose other members, apart from the chou- 
singha, are African. Most are large, and, with the exception of the 
elands and bongo, lack horns in the females. In the males the horns 
are angulated in front and generally spirally twisted, but in no case 
ridged. There are small face-glands, the muzzle is naked, and the tail 
is long and tufted. Except in the nilgai, the upper cheek-teeth have 
short and broad crowns. 
From the other members of the group the nilgai is readily 
distinguished by its short, upright horns, which, although angulated in 
front, show no distinct spiral twist. With a long and pointed head, 
this antelope has the fore-legs considerably longer than the hind 
pair; and it is chiefly to this peculiarity that its ungainly appearance 
is due. Both sexes have a mane on the neck, but the bulls alone 
possess a tuft of long hair on the middle of the throat. The general 
colour of the adult bull is dark grey, tinged with blue or brown; but 
the mane and tufts of long hair are black, and streaks and patches on 
the face, ears, and throat, as well as the under-parts, the lower surface 
of the tail, a streak down the buttocks, and a ring above and below 
