178 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Wing, always over 18.50; belly and thighs, never white ; only adult birds have 

 the hood and tail, white. 



Bald Eagle. 



Hnliaetua leucocephalus. 

 See No. 285. 



Section 3. Fourth primary, longest; tarsus, without 



feathers. 



Back, brown ; face, bare. 



Audubon's Caracara. 



Polybnrus cheriway. 

 See No. 297. 



Section 4. Fourth primary, longest; tarsus, partly (not 



entirely) feathered. 



Tail, rufous brown (adult) ; tail, whitish or grayish, with numerous brown bars 

 (immature). 



Red-tailed Hawk. 

 Buteo borealis, and races. 

 See No. 271. 



General plumage, dark sooty brown, sometimes with pale underparts, more or 

 less streaked and spotted. 



Marian's Hawk. 

 Buteo borealis harlani. 



See No. 274. 

 Wing, always over 18.50; only adults have head and tail white. 



Bald Eagle. 

 Haliaetus leucocephalus. 

 See No. 285. 



Section 5. Fourth primary, longest; tarsus, entirely 



feathered. 



Thighs, tawny, more or less streaked or barred. American Rough=legged Hawk. 



Archibuteo lac/opus sancti-johannis. 

 See No. 281. 



General plumage, sooty brown or black (black plumage). 



American Rough~legged Hawk. 



Archibuteo layopus sancti-johannis. 

 See No. 281. 



Thighs, tinged with deep rufous with numerous bars. 



Ferruginous Rough=legged Hawk. 



Archibuteo ferrugineus. 

 See No. 282. 



