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Description.—Above pure white; wings black, with a broad whitish subapical band across the first six primaries, beyond which the tips are blackish; tail black; beneath pure white: whole length 8·0 inches, wing 4·6, tail 4·2.

Description.—Above slaty blue; wing-feathers slaty, with narrow transverse bars of black; upper tail-coverts and tail white, the latter with a broad black subapical band and numerous narrow grey cross bars: beneath white, with slight grey cross bars on the belly; bill black; feet dirty yellow: whole length 25 inches, wing 18·5, tail 10·0.

Description.—Above black, varied and mottled with brown; wings black, with a broad white bar across the bases of the five outer primaries; tail black, with brown cross bands and a broad white subapical bar: beneath white, with dense blackish cross bands; breast blacker; broad throat-band white; bill black; feet pale brown: whole length 8·5 inches, wing 7·8, tail 4·0.

Description.—Above pale brown; nape plumbeous; outer wing-coverts and scapularies with a few black spots; wings dark grey, with fine white margins; tail plumbeous, broadly ended with white, and crossed by a subapical black band; middle rectrices like the back: beneath pale vinaceous, brighter on the breast, and whiter on the throat; bill black; feet yellow: whole length 9·0 inches, wing 5·5, tail 3·5.

Description.—Mantle brownish-black; primaries black, with white tips, and a subapical patch in old birds; rest of plumage white; bill yellow, orange at angle of lower mandible; legs and feet olive: whole length 21·0-22·0 inches, wing 17·0-18·0.