ORDER RAPTORES. 137 
(Birt, C 341a= Ri4n2, C)5on.] 
Geoc. Dist.— Arctic regions, including Arctic America and 
Greenland, wandering south in winter to Labrador and northern 
Maine. 
354. Falco rusticolus LInn. 
Gray Gyrfalcon. 
falco rusticolus Linn. S. N. ed. 10, I. 1758, 38. 
[B 12, C—, R 4124, C 500.| 
Geroc. Dist.— Arctic regions, including Iceland, southern Green- 
land, and Arctic America, straggling southward in winter. 
3542. Falco rusticolus gyrfalco (Linn.). 
Gyrfalcon. 
Falco gyrfalco Linn. S. N. ed. 10, I. 1758, 91. 
falco rusticolus gyrfalco StTEJN. Auk, II. 1885, 187. 
[B—, C 341, R 4124, C 498.] 
Geroc. Dist.— Northern Europe, Greenland, and Arctic America, 
from northern Labrador and Hudson Bay to Alaska; rarely south in 
winter to New England (Massachusetts and Rhode Island). 
3544, Falco rusticolus obsoletus (GMEL.). 
Black Gyrfalcon. 
falco obsoletus GMEL. S. N. I. i. 1788, 268. 
Falco rusticolus obsoletus StEJN. Auk, II. 1885, 187. 
[B—, C—, R 412¢, C 499.] 
Geroc. Dist.— Labrador, south in winter to Canada, Maine, and 
New York. 
355. Falco mexicanus SCHLEG. 
Prairie Falcon. 
falco mexicanus SCHLEG. Abh. Geb. Zool. 1841, 15. 
[iB ino, Ci s4e) Ri4ns, 'C coz.] 
Geroc. Dist.— United States, from the eastern border of the 
Plains to the Pacific, and from the Dakotas south into Mexico; 
casual eastward to Illinois. Breeds throughout its United States 
range. 
