Head large, compressed. Eyes of moderate size. Neck short and thick. Body compact, much depressed. Feet very short, placed far back; tarsus very short, compressed, having anteriorly in its whole length a series of small scutella, and above the outer toe a few broad scales, the rest covered with reticular angular scales. Hind toe very small, with a broad free membrane beneath; anterior toes longer than the tarsus, connected by reticulated membranes, having a sinus on their free margins, the inner with a narrow, lobed, marginal membrane, the outer with a thickened edge, the third and fourth about equal and longest, all covered above with numerous narrow scutella. Claws small, slightly arched, compressed, obtuse, that of first toe very small, of third largest, and with an inner thin edge. Plumage dense, soft and blended; feathers on the fore part of the head and cheeks very small and rounded, on the upper and hind parts, linear and elongated, as they also are on the lateral and hind parts of the upper neck, so that when raised they give the head a very tumid appearance, which is the more marked that the feathers of the neck beneath are short. Wings small, decurved, pointed; the outer primaries pointed, the first generally longest, the second slightly shorter, in some specimens a little longer, the rest rapidly graduated; the secondaries incurved, obliquely rounded, the inner much elongated. Tail short, graduated, of sixteen feathers. Bill black. Iris bright yellow. Feet orange-yellow, webs dusky, claws black. Head and upper part of neck deep green, changing to purple in certain lights. Back, posterior scapulars, inner secondaries, edge of wing, alula, primary coverts, primary quills, and four or five outer secondaries, black,—the back being darker and glossy, the wing-feathers tinged with brown. An elliptical patch between the base of the bill and the eye, lower part of neck all round, sides of the body anteriorly, the lower parts generally, the scapulars, excepting their margins, which are black, a large patch on the wing, including many of the smaller coverts, some of the secondary coverts, and six or seven of the secondary quills, pure white. The basal part of the secondary coverts black. Axillar feathers and lower wing-coverts dusky; the elongated feathers of the sides have the inner, some of them also their outer margins black, that colour in those of the innermost covering the whole inner web. The feathers on the legs, and along the sides of the rump dusky. The tail brownish-grey. Length to end of tail 20 inches, to end of wings 17-1/2, to end of claws 20-1/4; extent of wings 31-1/2; bill along the ridge 1-5/8, from the angles 2, along the edge of lower mandible 2-3/12; wing from flexure 9; tail 4-1/2; tarsus 1-5/12; hind toe (6-1/2)/12, its claw (2-1/2)/12; second toe 1-9/12, its claw (3-1/2)/12; third toe 2-1/4, its claw (4-1/2)/12; fourth toe 2-4/12, its claw 3/12. Weight 2 lb. 4-1/2 oz.