668 U. Ss. P. R. R. EXP, AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
however, viewed from the side, is about as long as the superior. There is not the slightest 
indication on either foot of the short supplementary hoofs above the others, usually seen in the 
ruminants. 
Fig. 23. Antilocapra americana.—Male. End of muzzle, as seen from above and in front. (Taken 
from a well mounted head.) 
Fig. 24. The under surface of left front hoof, 
The tail is very short, almost rudimentary, measuring only a few inches. It is much 
flattened and densely covered with hairs, which have a distichous arrangement on the under 
surface. 
The ears are long, narrow, and acuminate ; straight anteriorly. They are well covered with 
hairs on both surfaces. Their length, measured along the posterior outline, is about equal to 
the distance from the nose to the eye. 
The prevailing color of the back and upper half of the sides is yellowish brown, with 
rather a hoary aspect. The entire under parts, with the exception of certain marks on the 
throat, are white ; this color extends up on the sides so as to occupy half the circumference, 
and be abruptly defined as a slightly waving line. The color of the back extends down on the 
thighs and outside of the forelegs so as to form nearly aright angle with the white region. 
There’ is a broad square patch of white on the posterior part of the back, commencing a few 
inches anterior to the tail as a transverse line, then passing backwards with nearly parallel 
sides, involving the whole of the buttocks as seen from behind, and continuous with the white 
of the belly and inguinal region. There is sometimes a reddish central line dividing this patch 
on the back, and extending to the tail, which is itself occasionally colored like the back, some- 
times white. The size of the patch on the rump varies somewhat; sometimes beginning as 
much as six or seven inches anterior to the tail. 
There is a considerable variety of marking about the head and throat. Thus, the central 
half of the head is light yellowish brown above, pointed with dusky, and becoming paler on 
the sides. The sides of the head and the chin are white, this color commencing at the nasal 
septum and running, about an inch from the edge of the upper lip, backwards below the eye, 
and extending so far as to be separated from a white patch below the base of the ear only by a 
narrow isthmus of an inch. A very faint narrow reddish yellow line extends backwards from 
the angle of the mouth through this white patch, curving slightly upwards, and running into 
the tawny anterior to the eye. The lower part of the sides of the under jaw, for its posterior 
half, is like the back, but the colors of opposite sides are separated by an extension backwards 
of the white beneath the head. The neck all round may be described as of the color of the 
