178 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



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

 the hood and tail, white. 



Bald Eagle. 



Hnliai'tiix lencocephahis. 

 See Xo. 285. 



Section 3. Fourth primary, longest ; tarsus, without 



feathers. 



Back, brown; face, bare. 



Audubon's Caracara. 



Folijhtints clieriway. 



See No. 297. 



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



entirely) feathered. 



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

 (immature) . 



Red=tailed Hawk. 



Buteo horealis, and races. 

 See No. 271. 



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

 less streaked and spotted. 



Harlan's Hawk. 

 Buteo horealis harlani. 

 Sec No. 274. 

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



Bald Eagle. 

 Halieietna !encocephnIus. 

 See No. 285. 



Section 5. Fourth primary, longest; tarsus, entirely 



feathered. 



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



ArrhUmteo lagopns sancti-johannis. 

 See No. 281. 



(ieneral plumage, sooty browu or black (black plumage). 



American Rough=legged Hawk. 



Arrhibuteo Uujopus snr.eti-johaniiis. 

 See No. 281. 



Thighs, tinged with deep rufous with numerous b.ars. 



Ferruginous Rough°Iegged Hawk. 



Ardiihiiteo fernirjineiis. 

 See No. 282. 



