170 



KKY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Group 5. Wing, 15 to 17 inches long. 



Section 1. Second primary, longest; only first primary, 



emarginate, or notched. 



Duck Hawk. 



Length, under !!)• primaries, dark brown, banded on inner web with pale rufous. 



Duck Hawk. 



Falcu peregrimis unatum. 

 See No. 291. 

 Length, over 19; under tail coverts, wliite, witliout spots. 



White Qyrfalcon, 

 Falco islandus, and races. 

 See No. 286. 

 Length, over 19 ; under tail coverts, marked with dusky or spotted. 



Gray Qyrfalcon. 

 Falco rtisticolus. 

 See No. 287. 



