FAMILY FALCONID.E. HAWKS, I'ALCONS, KA(iLKs, I'/rO. 171 



Section 2. Second primary, longest ; first and second 

 primaries, emarginate or notched. 



Hack, eiilirely l»ro\vii; belly, white, without stroaks^ ; uiidcr tail c'i)vort>J, pun; 

 wliite; tarsus, nearly bare. 



Fish Hawk. 



Pnnilinn haliaftus rnroliutusix. 

 See No. 298. 



Hack, brown; belly, bro»vii ; under tail coverts, >V)t white. 



Black Gyrfalcon. 



Fiilro nisti<-nlii!< iihsoletus. 

 See No. 2S9. 



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



Gray Qyrfalcon. 



Falco rustkoluti, <nid races. 

 See No. 287. 



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



White Qyrfalcon. 



Fnlai islniidus. 

 See No. 286. 



Section 3. Third primary, longest. 



Four outer primaries, notched; basal portion of inner webs of primaries, largel}' 

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

 thickly feathered. 



American Rough-legged Hawk. 



Airhihnk'O biynjiiis saiicti-jolKOinis. 

 See No. 281. 



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

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

 thickly feathered. 



Ferruginous Rough-legged Hawk. 



Archibuteo ferrntjinens. 



See No. 28£. 



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

 primaries and tad, witli more or less white, or gray ; tarsus, thickly feathered. 



American Rough=legged Hawk (black plumage). 



Archilnili'ii liKjojiiis sini<-li-J(>li(iniiis. 

 See No. 281. 



m 



