BIRDS OF NEW YORK 



Memoir 12. N. Y. State Museum 



Plate 50 



GYRFALCON 

 Falco rusticolus gyr/alco Linnaeus 



WHITE GYRFALCON 

 Falco ialandus Briiunich 



BLACK GYRFALCON Falco rusticolus 

 All i nat. size 



s Gmelin 



