GRAY GYRFALCON. 



354. Falco rusticolus rusticolus. 23 in. 

 Head and under parts white heavily barred 



and streaked with dusky. Upper parts gray 

 with some dusky bars and whitish spots. 



Nest. On cliffs. Eggs cream-colored, dot- 

 ted and spotted all over with reddish-brown. 



Range. Arctic America. In winter south 

 rarely to northern border of the U. S. Gyr- 

 falcon, which is darker than the preceding, 

 also casually comes south to Minn, and Me. 

 Black Gyrfalcon, which is very much darker, 

 breeds in Ungava and casually occurs in Me. 

 in winter. 



PRAIRIE FALCON. 



355. Falco mexicanus. 18 in. 



Brownish above. Streaked and barred with 

 dusky below. Blackish patch on sides of 

 throat. 



Nest. On ledges or in trees. 



Range. From the Great Plains region to 

 the Pacific coast; north to British Columbia. 

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