170 



KF:Y to the lUKOS of KASTEUN NOltTH AMERICA. 



Group 5. Wing, 15 to 17 inches long. 



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

 emarginate, or notched. 



Duck Hawk. 



Leiiffth, under ID- primaries, dark brown, banded on inner web witli pale rufous. 



Duck Hawk. 



Falci) peregrimis unatum. 

 See No. 291. 

 Lenf!;Ui, over 19 ; under tail coverts, white, witliout spots. 



White Qyrfalcon. 

 Falco islaiuhis, mid races. 

 See No. 286. 

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



Qray Qyrfalcon. 

 Falco rnsticobis. 

 See No. 287. 



