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(3540) 
(358!) 
(359!) 
LIST OF THE BIRDS OF EASTERN NORTH AMERICA. 357 
Grexus HALIAETUS.  Savic. 
HALIAETUS ALBICILLA. (Lixn.) Gray Sea Eagle. 
Occurs in Greenland, but has not been taken in the United States. 
HALIAETUS LEUCOCEPHALUS. (Lixn.) 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 Haliaétus leucocephalus 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 Haliaétus leucocepha- 
lus alascanus, Northern Bald Eagle. 
Subfamily FALCONINAE. Falcons. 
Genus FALCO. Livy. 
FALCO ISLANDUS. Brinn. White Gyrfalcon. 
Arctic America; south in winter to Labrador and northern Maine. 
FALCO RUSTICOLUS. Lynn. Gray Gyrfalcon. 
Arctic America; accidental in winter as far south as Maine. 
Falco rusticolus gyrfalco. (LINN.) Gyrfalcon. 
A grayish race with faintly barred back; occurs in Arctic America ; 
accidental in winter in New England (Massachusetts and Rhode 
Island). 
Falco rusticolus obsoletus. (Gmeu.) 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. 
FALCO MEXICANUS. Scuiec. Prairie Falcon. 
Western species ; casual in Illinois; breeds throughout its range. 
SUBGENUS RHYNCHODON. NiI?rzscuH. 
FALCO PEREGRINUS ANATUM. (Bonar.) Duck Hawk. Peregrine 
Falcon. 
North America and northern South America; breeds throughout its 
range. 
SUBGENUS AESALON. Kaur. 
FALCO COLUMBARIUS. Linn. Pigeon Hawk. 
North America, West Indies, and northern South America; breeds from 
northern border of United States, northward. 
FALCO REGULUS. Pati. Merlin. 
European species ; recorded from Greenland. 
SuBGENUus TINNUNCULUS. LINN. 
FALCO TINNUNCULUS. Lixn. Kestrel. 
European species ; once taken in Massachusetts. 
