141 
{228a. Halieétus albicilla groenlandicus Brehm, 
Handb. Naturg. V6ég. Deutschl., p. 16 
(1831). [Greenland.} 
Greenland White-tailed Eagle. 
Larger ; wing $615, 9 ad. 720 mm. (juv. 
685-710 imm-). (ci. Hartert, Wégel d. 
palaarkt Fauna, p. 1178). 
+*229. Halieétus  leucocephalus —_leucocephalus 
(Linn.); S.N., ed. xii.,1., p. 124 (1766). [ex 
Catesby—Carolina. | 
Bald Eagle. 
Wing ad. 585-625 mm.; head and meck 
all round, rump, upper tail-coverts and tail 
pure white. Immature: head and neck 
black and tail mingled white and black at 
first. 
$229a. Halieétus leucocephalus alascanus C. H. 
Townsend, Proc. Biol. Soc. Wash., x1., p. 
145 (1897). [Unalaska, type in U.S. Nat. 
Mus. ] 
Alaskan Bald Eagle. 
Rather larger; wing § 625-635, 2 600- 
642 mm. 
Greenland. 
Canada and 
United States, 
S. to Lower 
California and 
N. Mexico. 
N.W. Alaska, 
Bering I., 
N.W. Mackenzie 
and N. Ungava 
S. to Brit. 
Columbia and 
Great Lakes. 
Gen. LXIV. THALASSOAETUS Kaup (1844). 
Type by monotypy Aguila pelagica Pall. 
Tail strongly graduated, with 14 feathers, instead 
of 12; bill larger and more powerful, height 
greater but variable. 
