FALCONID&. 223 



naked portion of tarsus in front ; 

 lores densely feathered. 



Accipiter. (Page 227.) 

 A*. Depth of bill at base decidedly less 

 than chord of culraen; middle 

 toe much shorter than naked 

 portion of tarsus in front ; lores 

 nearly naked. 



Parabuteo. (Page 228.) 

 f. Tail not more than two-thirds as long as 



wing. 



A; 1 . Primaries exceeding secondaries by 

 less than length of naked portion 

 'of tarsus in front. 



Urubitinga. (Page 238.) 

 A 2 . Primaries exceeding secondaries by 

 much more than length of naked 

 portion of tarsus in front. 

 I 1 . Wing less than four times as 

 long as tarsus. 



Asturina. (Page 239.) 



P. Wing more than four times as 



long as tarsus. 



Buteo. (Page 229.) 

 e*. Tarsi densely feathered in front and on sides, down to base of 



toes Archibuteo. (Page 240.) 



(P. Wing more than 18.00. 



e 1 . Tarsus densely feathered, all round, down to base of toes. 



Aquila. (Page 241.) 

 e*. Tarsus naked, all round, for lower third, or more. 



/*. Wing much rounded (fifth to seventh quills longest, the 

 first shortest), the secondaries very large and broad, 

 reaching nearly or quite to tips of quills ; tail nearly 

 as long as wing ; occiput conspicuously crested ; feet 



enormously developed Thrasaetus. (Page 242.) 



/*. Wing pointed (third to fifth quill longest, the first longer 

 than ninth), the secondaries only moderately devel- 

 oped, their ends falling far short of tips of quills ; tail 

 less than two-thirds as long as wing; occiput not 

 crested ; feet moderately developed. 

 g 1 . Tail rounded, consisting of 12 feathers. 



Haliseetus. (Page 242.) 

 g*. Tail graduated, or wedge-shaped, consisting of 14 



feathers Thalassoaetus. (Page 243.) 



b l . Nostril small, circular, with a conspicuous central bony tubercle, or else 



