IJIRnS OF Ni:\V YORK 



lemoir 12. N. Y. State Museut 



Plate 50 



GYRFALCON 

 Falca rusltnilu.s gyr/alco Linnaeus 



WHITE GYRFALCON 

 Falco laliindux Briinnich 



BLACK GYRFALCON Falco ruslicolus obsoleliis Gmelin 

 All } nat. size 



