Male. Tarsus with a few scutella; toes terminally scutellate. Male with the bill, cere, iris, and feet yellow; the head, the neck for half its length, the rump, upper and lower tail-coverts, and tail white; the rest of the plumage chocolate-brown, the terminal margins of all the feathers pale greyish-brown. Female similar. Young with the bill brownish-black, iris dark brown, feet yellow; the general colour of the plumage very dark chocolate, uniform, the feathers without edgings, all white at the base, that colour appearing more or less on the hind part, and more especially on the fore part and sides of the neck, and on the sides of the body and lower wing-coverts; quills and tail-feathers brownish-black, tinged with grey toward the base; the latter with the greater part of the inner webs, and a portion of the outer brownish-white, freckled with dusky. In more advanced stages the colours of the plumage vary considerably in different individuals. The general tint continues brown for several years, a variable and often a large proportion of white, or brownish-white, appearing on the neck, the lower part of the body, the sides, and under the wings, the tail meanwhile gradually becoming white in freckled patches, some have a large patch of brownish-white across the breast. When the feathers are new, they are of a glossy deep brown, but when old and worn they present a bleached appearance, and the upper parts are often patched with pale brown or brownish-white. On account of these circumstances, individuals of different ages, and shot at different periods of the year, differ so much from each other in appearance, that one might, without a very extended comparison, conceive that in a collection of specimens, there might be several species. The bill remains dark until the head and tail become white; the anterior tarsal scutella differ from none to six, the posterior from nine to twelve; those on the hind toe are four, on the middle toe from nine to thirteen. _Male_, 34, 84. Throughout North America. Resident in the south and west. Bald Eagle, Falco Haliaetus, Wils. Amer. Ornith. v. iv. p. 89. Adult. Sea Eagle, Falco ossifragus, Wils. Amer. Ornith. v. vii. p. 16. Young. Falco leucocephalus, Bonap. Synops. p. 26. Aquila leucocephala, White-headed Eagle, Swains. & Rich. F. Bor Amer. v. ii. p. 15. White-headed or Bald Eagle, Falco leucocephalus, Nutt. Man. v. i. p. 72. White-headed Eagle, Falco leucocephalus, Aud. Ornith. Biog. v. i. p. 160, v. ii. p. 160, v. v. p. 354. GENUS V. PANDION, Sav. OSPREY.