1. Haliaetus pelagicus. (Pallas.) The Northern Sea Eagle. Aquila pelagica. Pallas, Zoog. Rosso-Asiat., I. p. 343. (1811.) “Aquila marina. Steller, MSS.” Pallas as above. Falco imperator. Kittlitz., Kupf. Nat. Vog., pt. I. p. 3. (1832.) Falco leucopterus. Temm., Pl. col. 1. p. (no page.) Kittlitz Kupf., pl. 2; Temm., Pl. col. I., pl. 489. Cassin. B. of California and Texas, I., pl. 6. The largest of the Eagles. Wings rather shorter than usual in this genus; tail wedge-shaped, and composed of fourteen feathers. Adult. Large frontal space, greater wing-coverts, abdomen and tail white; all other parts of the plumage dark brown or brownish-black; bill and legs yellow. Younger. Tail white, more or less marked with brownish-black. All other parts brownish-black, lighter on the head and neck. Quills black, secondaries and tertiaries white at their bases; bill and feet yellow. Dimensions. _Female_—total length, 3 feet 8 inches; wing, 2 feet 2 in.; tail, 1 foot 4 inches. Hab. Russian-American Islands (Pallas); Japan (Temminck & Schegel). Spec. in Mus. Acad., Philada. Obs. This very large and powerful bird inhabits north-eastern Asia and the islands between that continent and America, and probably other parts of Russian-America. It is the largest of the Eagles, and appears to be related to the species immediately succeeding. 2. Haliaetus Washingtonii. (Aud.) The Washington Eagle. Falco Washingtonii. Aud. Orn. Biog., I. p. 58. (1831, plate pub. 1827) Falco Washingtoniana. Aud. Louden’s Mag., I. p. 115. (April, 1828) Aud. B. of Am. pl. 11; oct. ed. I., pl. 13. Large, “bill shortish, very deep, compressed; feet rather short, with the leg long; the tarsus short, rounded, anteriorly covered with transversely-narrow sentella, posteriorly with small tuberculous scales; feathers of the head, neck and breast narrow and pointed; wings long, second quill longest; tail of ordinary length, rounded, extending considerably beyond the tips of the wings, of twelve broad acute feathers.” “Bill bluish-black, the edges pale, the soft margin towards the commissure, and the base of the under-mandible yellow; cere yellowish-brown; lore light greenish-blue; iris chestnut-brown; feet deep yellow; claws brownish-black; upper part of the head, hind neck, back, scapulars, rump, tail-coverts and posterior tibial feathers blackish-brown, glossed with a coppery tint; throat, fore-neck, breast and belly light brownish-yellow, each feather marked along the centre with blackish-brown; wing-coverts light grayish-brown, those next the body becoming darker and approaching the color of the back; primary quills dark-brown, deeper on their inner-webs; secondaries lighter, and on their outer-webs of nearly the same tint as their coverts; tail uniform dark-brown; anterior tibial feathers grayish-brown.”