The eyes of the prong-buck are black, large, and expressive, but not a trace exists of a larmier or crumen, a glandular opening beneath the eyes, so conspicuous in the generality of deer. The hoofs are narrow and acute, but no trace exists of the supplementary hoofs usually found in all ruminants, situated just above the pasterns, at the back of the legs. The ears are very long, and well adapted to catch the faintest sound. The hair is coarse, crimped or wavy; growing in a tuft on the forehead, and during summer in a mane on the neck and back of the male. About the posterior third of the back is an opening like the tear-gland in the face of a deer, from which a musky-smelling secretion continually oozes. The animal has also the power of erecting the hair of the white patches on its rump, as a peacock spreads its tail, or a wolf bristles its back. This power of elevating, or apparently _puffing-out_, these snowy markings, adds immensely to the general beauty of the prong-buck. When wooing, or striving to make the most favourable impression on his harem of does, or when in defence of his wives he rushes at some intrusive rival, the snowy round patches are ‘ruffed’ to treble their natural size. The geographical distribution of the prong-buck is rather extensive. North it is found as far as the northern branches of the Saskatchewan, 53° N. lat. It ranges over all the plains from the Missouri to the eastern slopes of the Rocky Mountains; southerly into Mexico, as far as the mouth of the Rio Grande; through Oregon and California, and into Washington Territory, along the banks of the Columbia, to the Spokan river. Their favourite haunts appear to be the grassy prairies, that extend hundreds of miles without a break through Texas and Oregon, dotted everywhere with small patches of timber. As the eye wanders over the limitless tract of prairie, these small isolated belts and clumps of trees exactly resemble beautifully-wooded islands, studding a sea of waving grass. Here the prong-buck wanders in herds of from sixty to seventy; naturally shy, approaching them is not by any means an easy matter; on the least alarm the males give the shrill whistling snort, toss their graceful heads, sniff the air, stamp with their forefeet, then bound away like the wind; the herd circle round at first, then wheel up again in tolerable line, have another look, and, if apprehensive of danger, dash off, and seldom stop until safe from all risk of harm.