The PARTRIDGES (_Perdices_), one of the most numerous groups of the order, are comparatively slenderly built birds, with small heads and unfeathered tarsi. The wings, in which the third or fourth quill exceeds the rest in length, are relatively quite as short and rounded, but not so much arched as those of the _Tetraones_. The tail, composed of from twelve to sixteen feathers, is always short. The somewhat elongated beak is but slightly raised at its culmen, and compressed at its sides. The tarsus is frequently furnished with one, or occasionally with two spurs. The members of this group are without the warty skin above the eyes possessed by the birds above described; in some species, however, bare patches are observable on those parts, and on the throat. The plumage is smooth, and very similarly coloured in both sexes. These birds inhabit all portions of the eastern hemisphere, except its extreme north, and frequent every variety of locality from the coast to a very considerable height on mountain ranges. Some species prefer cultivated lands, while others are found in forests where they may occasionally be seen perched on the branches of trees. Their food consists of insects, grain, and portions of plants. The nest is a mere hole scratched in the dry mould, generally under the shelter of some bush or tuft of grass. The eggs, from twelve to twenty in number, are hatched in three weeks time; the female sits exceedingly close on her nest during this period, especially during the latter part of incubation, and offers a bold resistance to any enemy seeking to plunder her; but if quietly approached, both she and her eggs may be gently removed, and she will hatch them in confinement, departing with her young to the fields as soon as the latter are able to accompany her. The male takes no part in the labour of incubation, but like all birds that pair, he is attentive to his mate, assists her in defending the brood, and uses many arts to lure intruders from the nest. The young are reared on small insects, larvæ, and the eggs of insects; the parents leading them to the places where these are deposited, and scraping away the mould. Multitudes of ants and larvæ are eaten by young Partridges. * * * * * The SNOW PARTRIDGES (_Tetraogallus_) may be regarded as combining the characteristics of both the Ptarmigans and Partridges. Their body is compactly framed, their neck short, the head small, the wing of moderate size, and slightly pointed at the extremity, its second and third quills being longer than the rest. The gently-rounded tail is of medium length; the beak long, broad, and powerful, and the heavy short foot furnished with a blunt spur. The thick plumage is much developed on the tail-covers; a small patch behind the eye is unfeathered. THE CASPIAN SNOW PARTRIDGE.