141 



t228a. Haliceetus albicilla groenlandicus Brehm, 

 Handb. Naturg. Vog. Deutschl., p. 16 

 (1831). [GreefUa^d.] 

 Greenland White-tailed Eagle. 



Larger ; wing ^ 615, $ ad. 720 mm. (juv. 

 685-710 mm.) (cf. Hartert, Vogel d. 

 palaarkt Fauna, p. 1178). 



Greenland. 



t*229. HalicBetus leucocephaltis lettcocephalus 

 (Linn.), S.N., ed. xii., i., p. 124 (1766). [ex 

 Catesby — CaroUna.] 

 Bald Eagle. 



Wing ad. 585-625 mm. ; head and neck 

 all round, rump, upper tail-coverts and tail 

 pure white. Immature : head and neck 

 black and tail mingled white and black at 

 first. 



Canada and 

 United States, 

 S. to Lower 

 California and 

 N. Mexico. 



t229a. Haliaetus leucocephalus alascanus C. H. 

 Townsend, Proc. Biol. Soc. Wash., xi., p. 

 145 (1897). [Unalaska, type in U.S. Nat. 

 Mus.] 

 Alaskan Bald Eagle. 



Rather larger ; 

 642 mm. 



wing <? 625-635, ? 600- 



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 Aquila pdagica Pall. 



Tail strongly graduated, with 14 feathers, instead 

 of 12; biU larger and more powerful, height 

 greater but variable. 



