] FALCONIDZA, 223 
naked portion of tarsus in front; 
lores densely feathered. 
Accipiter. (Page 227.) 
#, Depth of bill at base decidedly less 
than chord of culmen; middle 
toe much shorter than naked 
portion of tarsus in front; lores 
nearly naked. 
Parabuteo. (Page 228.) 
7. Tail not more than two-thirds as long as 
wing. 
}', Primaries exceeding secondaries by 
less than length of naked portion 
of tarsus in front. 
Urubitinga, (Page 238.) 
ik’. Primaries exceeding secondaries by 
much more than length of naked 
portion of tarsus in front. 
. Wing less than four times as 
long as tarsus. 
Asturina, (Page 239.) 
?, 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 
OOS: icc ican snentacecsnncinonvanieamnene® Archibuteo. (Page 240.) 
d@. Wing more than 18.00. 
e'. Tarsus densely feathered, all round, down to base of toes. 
Aquila. (Page 241.) 
é*., Tarsus naked, all round, for lower third, or more. 
J. 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...... Thrasaétus. (Page 242.) 
f?. 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. Tail rounded, consisting of 12 feathers. 
Halizétus. (Page 242.) 
gy’. Tail graduated, or wedge-shaped, consisting of 14 
feathers......sceeeeee Thalassoaétus. (Page 243.) 
6. Nostril small, circular, with a conspicuous central bony tubercle, or else 
