Falco ichthyætus Horsfield, Trans. Linn. Soc. (1821), 13, pt. 1, 136. Polioaetus ichthyaetus Sharpe, Cat. Birds Brit. Mus. (1874), 1, 452. Polioaëtus ichthyaëtus Sharpe, Hand-List (1899), 1, 279; Oates, Cat. Birds' Eggs (1902), 2, 217; McGregor and Worcester, Hand-List (1906), 45. Basilan (Bourns & Worcester); Bongao (Everett); Calamianes (Bourns & Worcester); Luzon (Whitehead); Mindanao (Steere Exp., Celestino); Mindoro (Bourns & Worcester, McGregor); Negros (Keay); Samar (Whitehead). Malay and Indian Peninsulas, Burmese provinces, Greater Sunda Islands, Celebes, Ceylon. "Adult male.--Above brown, paler on the interscapulary region and darker on the wings, primaries blackish; under surface of wing leaden brown, with a whitish spot at base of primaries; tail white, with a broad terminal bar of brown; entire head and neck all round clear ashy gray; breast brown, a little lighter than the back; belly, vent, thighs, lower flanks, and under tail-coverts pure white; under wing-coverts uniform ashy brown. Cere and bill blackish; feet dirty yellowish white; iris brown. Length, 660; culmen, 58; wing, 457; tail, 254; tarsus, 95. "Adult female.--Similar to the male but larger. Length, 737; wing, 518; tarsus, 99. "Young.--Above brown, glossed with chocolate, most of the feathers of the upper surface with paler brown margins; feathers of the head and hind neck mesially streaked with fulvous; sides of face a little paler than the head, but streaked in the same manner; under surface of body pale brown, inclining to rufous, and longitudinally streaked with whitish down the center; thighs white, much mottled with rufous-brown; lower abdomen, vent, and under tail-coverts pure white; under wing-coverts pale brown, plainly streaked with white, the greater series almost entirely white, with a few brown markings; quills brown, white at base of inner web, the white extending further on secondaries; which have ashy brown cross-bars; tail fulvous brown, mottled all over with dark brown, except at the tip, which is uniform dark brown, forming a very distinct band. "The bird above described, though full grown, is evidently immature as regards its plumage. The second stage is very similar to the adult, but is by no means so gray on the head and throat." (Sharpe.) "Less common than Haliæetus leucogaster but frequents the same localities. Quite abundant at Lake Naujan in Mindoro." (Bourns and Worcester MS.) A few individuals were seen near the Baco River in Mindoro and Celestino took a pair of young birds in northern Mindanao. Order STRIGIFORMES. OWLS.