The CAPUEIRA PARTRIDGE (_Odontophorus dentatus_), the largest species of the entire family, represents a group of powerfully-built birds, with comparatively long necks and moderate-sized heads, their short tail, rounded at its extremity, is formed of soft feathers; the short, decidedly-rounded wing has its fifth and sixth quills longer than the rest; the strong, hooked beak is compressed at its sides, and has the high upper mandible much vaulted; the margins of the lower mandible are furnished with two well-defined tooth-like appendages. The tarsi are high, the toes long, armed with sharply-pointed hooked claws, and protected by large horny scales. The plumage, which is alike in the two sexes, is prolonged into a crest on the head; the eye is surrounded by a broad, brightly-coloured skin. This species is yellowish brown on the nape, back, wings, and tail; the crown of the head is brown, and a cheek-stripe that extends to the nape is reddish yellow, dotted with a lighter shade: the feathers on the throat and upper portion of the back are spotted with brown and black, and striped with yellow; those on the shoulders have a large black triangular patch on the inner web. The feathers of the wing-covers have a pale, yellow, heart-shaped spot at their tip, whilst the lower shoulder-feathers and exterior secondaries are edged with reddish yellow on the inner web, and streaked with black, the centre part of each being also varied with reddish grey and brown. The brown primary quills have the outer web dotted with white, and the shaft grey; the secondaries are marked with reddish yellow on the outer web. All the feathers on the hinder parts of the body and tail are of mottled reddish yellow in the centre, with a pale yellow border, and a black spot at the tip; those on the under side are slate-grey, edged with brown. The eye is brown, the bare ring that surrounds it deep flesh-red, the beak black, and the foot greyish red. The female is of paler hue, and the young show more reddish brown in their plumage than the adult male. The length of the body is sixteen inches and a half, the wing measures three inches and a half, and the tail three inches. This bird is found in suitable localities in most parts of Brazil, from the Rio de la Plata to the Amazon. We are indebted to the Prince of Wied for what we know of its life and habits.