178 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Wiug, always over 18.50; belly and thighs, never white ; only adult l)inls have 



the hood and tail, white. 



Bald Eagle. 



Jldliactns Itucocephnlus. 



See No. 2S5. 



Section 3. Fourth primary, longest ; tarsus, witliout 



featliers. 



Back, brown; face, hare. 



Audubon's Caracara. 



Pohjhonis cheriway. 



See No. 297. 



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



entirely) feathered. 



Tall, rufous brown (adult) ; tail, whitish or grayish, with inimerous brown bars 

 (immature). 



Red=tailed Hawk. 



Butco borealis, and races. 

 See No. 271. 



General plumaoe, dark sooty brown, sometimes with pale uiiderparts, more or 

 less streaked and spotted. 



Harlan's Hawk. 

 Butco horealis harlani. 

 See No. 274. 

 Wing, always over IS. 50; only adults have head and tail white. 



Bald Eagle. 

 Ilaliaetns Icucocephnlus. 

 See No. 285. 



Section 5. Fourth primary, longest; tarsus, entirely 



feathered. 



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



Archihuteo lot/opus s<mcti-johannis. 

 See No. 281. 



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



American Rough=legged Hawk. 



Archibutfiu hitjopns sancti-johannis. 



See No. 281. 



Thighs, tinged with deep rufous with numerous bars. 



Ferruginous Rough-legged Hawk. 



Ardiihuteo ferrugiiunis. 

 See No. 282. 



