170 



KEY 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 19- primaries, dark brown, banded on inner web with pale rufous. 



Duck Hawk. 



Falco peregrinus anatum. 



See No. 291/ 

 Length, over 19 : under tail coverts, white, without spots. 



White Qyrfalcon. 



Falco islandus, and races. 

 See No. 286. 



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



Gray Qyrfalcon. 



Falco rusticolus. 

 See No. 287. 



