LIST or THE BIRDS OF EASTERN NORTH AMERICA. 357 



A. o. u. Genus HALIAETUS. Savig. 



NO. 



284 (351) HALIAETUS ALBICILLA. (Linn.) Gray Sea Eagle. 



Occurs in Greenland, but has not been taken in the United States. 



285 (352) HALIAETUS LEUCOCEPHALUS. (Linn.) Bald Eagle. 



Throughout North America to northern Mexico ; breeding throughout its 

 range. 



Mr. C. H. Townsend has lately separated the northern and southern birds, 

 giving the range of Haliaetus leucocephahis as practically restricted to the 

 United States. To the bird which occurs in the British possessions west 

 to Alaska, which is larger, he has given the name of Haliaetus leucocepha- 

 lus alascanus, Northern Bald Eagle. 



Subfamily FALCONIN/E. Falcons. 

 Genus FALCO. Linn. 



286 (353) FALCO ISLANDUS. Brunn. White Qyrfalcon. 



Arctic America ; south in winter to Labrador and northern Maine. 



287 (354) FALCO RUSTICOLUS. Lynn. Gray Qyrfalcon. 



Arctic America; accidental in winter as far soutli as Maine. 



288 (354a) Falco rnsUcolus gyrfalco. (Likn.) Gyrfalcon. 



A grayish race with faintly barred bacli ; occurs in Arctic America ; 

 accidental in winter in New England (Massachusetts and Rhode 

 Island). 



289 (3546) Falco rusHcolus obsoletus. (Gmel.) Black Gyrfalcon. 



A dark race with back dark slate ; sometimes almost black and not 

 barred ; underparts dark ; it occurs in Labrador ; accidental in 

 winter as far south as Canada, Maine, Massachusetts, and New 

 York. 



290 (355) FALCO MEXICANUS. Schleg. Prairie Falcon. 



Western species ; casual in Illinois ; breeds throughout its range. 



Subgenus RHYNCHODON. Nitzsch. 



291 (356) FALCO PEREQRINUS ANATUM. (Bonap.) Duck Hawk. Peregrine 



Falcon. 



North America and northern South America; breeds throughout its 



range. 



Subgenus /ESALON. Kaup. 



292 (357) FALCO COLUMBARIUS. Linn. Pigeon Hawk. 



North America, West Indies, and northern South America ; breeds from 

 northern border of United States, northward. 



293 (3581) FALCO REQULUS. Pall. Merlin. 



European species ; recorded from Greenland. 



Subgenus TINNUNCULUS. Linn. 



294 (3591) FALCO TINNUNCULUS. Linn. Kestrel. 



European species ; once taken in Massachusetts. 



