FAMILY FALCONID^E. HAWKS, FALCONS, EAGLES, ETC. 171 



Section 2. Second primary, longest; first and second 

 primaries, emarginate or notched. 



Back, entirely brown; belly, white, without streaks; under tail coverts, pure 

 white; tarsus, nearly bare. 



Fish Hawk. 



Pandion haliaetus carolincnsis. 

 See No. 298. 



Back, brown ; belly, brovn ; under tail coverts, ^t white. 



Black Qyrfalcon. 



Falco rusticolus obsoletus. 

 See No. 289. 



Back, slaty brown and white; under tail coverts, spotted or marked with dusky. 



Gray Gyrfalcon. 



Falco rusticolus, and races. 

 See No. 287. 



Back, white, or white streaked with slaty brown ; under tail coverts, white. 



White Gyrfalcon. 



Falco islandus. 

 See No. 286. 



Section 3. Third primary, longest. 



Four outer primaries, notched; basal portion of inner webs of primaries, largely 

 white, without bars ; thighs, tawny or buff, more or less barred; tarsus, 

 thickly feathered. 



American Rough-legged Hawk. 



Archibuteo lagopus sancti-johannis. 

 See No. 281. 



Four outer primaries, notched; basal portion of inner webs of primaries, largely 

 white, without bars ; thighs, tinged with deep rufous, heavily barred ; tarsus 

 thickly feathered. 



Ferruginous Rough-legged Hawk. 



Archibuteo ferrugineus. 



See No. 282. 



General plumage, entirely sooty brown, or black ; four outer primaries, notched ; 

 primaries and tail, with more or less white, or gray ; tarsus, thickly feathered. 



American Rough-legged Hawk (black plumage). 



Archibuteo lagopus sancti-johannis. 

 See No. 281. 



