Bohol (McGregor); Calayan (McGregor); Guimaras (Steere Exp.); Luzon (Jagor, Heriot, Steere Exp., Bourns & Worcester, Whitehead, McGregor, Stafford); Mindanao (Mearns); Panay (Clarke). [10] Borneo, southern China, Burmese provinces, Formosa, Hainan. Adult in breeding plumage.--Above dark, glossy seal-brown; chin, fore throat, and cheeks blackish; throat, sides of neck, and ear-coverts chestnut; breast and abdomen silvery white, mixed with a little blackish brown and gradually shading into blackish brown on fore breast, sides, flanks, and lower belly; thighs blackish mixed with a little light chestnut; wings black; under wing-coverts, axillars, and tips of short secondaries white. "Iris straw-yellow; bill black, whitish at the tip; naked skin at base of bill and between rami of the mandible pale greenish yellow; legs blackish gray, with a slight tinge of green." (Swinhoe.) A male from Calayan, November 15, 1903, measures: Length, 280; wing, 107; culmen broken; tarsus, 33; middle toe with claw, 48. The following data are from a female taken at Jala Jala, Laguna de Bay, Luzon, January 5, 1902. Feet bluish black; angle of mouth and base of lower mandible clear, pale pea-green; bill black with a light spot at tip. Wing, 100; exposed culmen, 23; tarsus, 33; middle toe with claw, 49. A female from Sevilla, Bohol, March 24, 1906, measures: Length, 254; wing, 102; exposed culmen, 23; tarsus, 33; middle toe with claw, 49. The non-breeding bird has the chin and throat white and the chestnut reduced in extent and lighter in shade. Young.--A half-grown downy young was obtained at Laguna de Bay, August 24, 1904. Above seal-brown with white tips to much of the down; middle of crown mottled with chestnut; a white line over eye; two diagonal white lines on each side of occiput, the anterior line continued along side of neck; chin, throat, and face mottled with white, black, and dark gray; fore breast, sides, and lower belly gray; middle of breast and belly white. Bill pale yellow mottled with blackish brown, tip gray; legs black. Length, 203. A full-grown young bird has upper parts light brown; sides of head and neck buffy brown, mottled and streaked with white; chin and upper throat white; a wide dull buffy brown band around neck; breast and abdomen pure white; thighs buff-brown. "Comparatively rare. Several specimens were secured by the Steere Expedition in a little pond in Guimaras. Fairly common in the Laguna de Bay, Luzon, but we failed entirely to find it in the Laguna de Naujan, Mindoro." (Bourns and Worcester MS.) Order PROCELLARIIFORMES. PETRELS AND SHEARWATERS.