Tarsus slender, feathered at base; bill slender, gape small, and nostril covering conspicuously swollen; tail nearly square or greatly graduated; colors blackish or reddish brown. Subfamilies. a1. Tail moderate, nearly square; plumage mostly blackish with purple and green metallic reflections. ... Columbinæ (p. 51) a2. Tail greatly elongated and graduated; plumage mostly chestnut or rufous-brown with little metallic color. ... Macropyginæ (p. 52) Subfamily COLUMBINÆ. Genus COLUMBA Linnæus, 1758. Bill comparatively slender; membrane behind nostril greatly swollen and bulging out on the side; first primary very slightly scooped on inner web; tarsus feathered at the base. The only Philippine species is almost entirely black, glossed with green and purple. 43. COLUMBA GRISEOGULARIS (Walden and Layard). GRAY-THROATED PIGEON. Ianthoenas griseogularis Walden and Layard, Ibis (1872), 104, pl. 6. Columba griseigularis Salvadori, Cat. Birds Brit. Mus. (1893), 21, 313; Sharpe, Hand-List (1899), 1, 72; McGregor and Worcester, Hand-List (1906), 13. Bá-lud mai-tim, Manila; bá-duc, Batan. Basilan (Everett, Bourns & Worcester); Batan (McGregor); Cagayan Sulu (McGregor); Calayan (McGregor); Guimaras (Layard, Meyer); Lubang (McGregor); Luzon (Gevers, Whitehead); Mindanao (Steere Exp., Platen, Goodfellow); Mindoro (McGregor); Negros (Everett, Whitehead); Romblon (McGregor); Sibutu (Everett); Sibuyan (McGregor); Sulu (Burbidge); West Bolod (Mearns). Northern Borneo. Adult (sexes alike).--General color slate-black with metallic purple or green tips to the feathers; chin, upper throat, and sides of face below eyes pale gray; head, neck, back, breast, abdomen, and tips of wing-coverts, and upper and under tail-coverts glossed with metallic purple changing to green; remiges and rectrices black without metallic reflections, their coverts largely black with only the tips metallic; colors change greatly with the angle at which the specimen is held. Iris bright yellow; base of bill dark red, tip light yellow; feet and bare space about eye red. Length, 380 to 430; two males, wing, 248; tail, 161; exposed culmen, 22; tarsus, 28. Young.--Differs from the adult in having metallic edges of feathers narrower on body, and wanting on wing-coverts; throat and breast blackish brown, each feather tipped with cinnamon. Although of wide distribution, this species does not occur in great numbers except on the Island of Batan in the Batanes group where many individuals are caught with bird-lime and sold to visiting ships. Subfamily MACROPYGINÆ. Genus MACROPYGIA Swainson, 1837. Bill small and rather slender; upper part of tarsus slightly feathered; tail long and greatly graduated; longest and shortest rectrices differing in length by about half the wing. Species.