MAMMALIA. 265 
holding up a white rag, or clothing themselvés in a white shirt, and shewing 
themselves only at intervals*. By these and similar manoeuvres, the curiosity 
of a herd of antilopes is so much roused that they wheel round the object of their 
attention, and at length approach near enough to enable the hunter to make sure 
of his mark. From this disposition of the prong-horned antilopes, they are more 
easily killed than any of the deer of the district which they inhabit. They are, 
however, objects of little interest to the Indians, who eat their flesh only when the 
bison, moose or wapiti are not to be procured, and their skins are of no value as 
an article of trade. The Mandans on the Missouri are said to capture them in 
pounds. The antilopes feed on the grass of the plains during the summer, and, 
according to Lewis and Clark, they migrate towards the mountains at the com- 
mencement of winter, and subsist there during that season on leaves and shrubs. 
They bring forth one, or more rarely two, young early in June. 
DESCRIPTION 
Of a male, killed at Carlton, in June 1827.—This individual must have attained a considerable age, as the sagittal and 
some other sutures of the scull were obliterated. 
Dental formula, incisors 2, canines =, grinders $$ = 32. 
Incisors white ; the two exterior incisors are much smaller than the others, and they are 
all disposed with their edges tiled slightly over each other, and their points inclining outwards 
in the segment of a circle, adapted to the reception of the callous pad, which terminates the 
upper jaw. The upper grinders gradually increase in size from the first to the fourth, which 
is considerably larger; the fifth is of equal or, perhaps, greater size than the fourth; and the 
sixth is somewhat smaller, The three posterior ones have each a deep furrow on their inner 
sides, corresponding to a fold or ridge of enamel on the outer side, so, at first sight, each 
appears like two teeth. The furrow is shallow in the third tooth, and does not exist in the 
two first. In the lower jaw, the posterior grinder is the largest, and is divided into three 
portions by two deep furrows on its exterior side. The fourth and fifth have, each, one deep 
furrow, and the third has two shallow furrows; these three are nearly equal to each other 
in size, and are a little smaller than the sixth one. The first and second lower _ grinders are 
much smaller than the others. 
In the scull there is a considerable Te in the frontal bone, between the anterior 
parts of the orbits; the orbits project considerably, and the solid osseous nucleus of the horn 
is seated on the projecting plate. The supra-orbitar foramen is situated close to the inner 
* “ This same curiosity enables the wolves to make them a prey: for sometimes one of them will leave his compa- 
nions to go and look at the wolves, which, should the antelope be frightened, at first crouch down, repeating the 
maanceuvre, sometimes relieving each other, until they succeed in decoying it within their power, when it is pulled down 
and deyoured.”—Gonman, Nat. Hist., vol. ii. p. 323. 
2M 
