FALCOXS, HAWKS, EAGLES, ETC. 



147 



2'. Claws not all the same length, grooved on under side. 



3- Tarsus feathered to base of toes Aquila, p. 163. 



3 . Tarsus not feathered to base of toes .... Haliasetus. p. 165. 

 1'. Wing- less than 17. T'W^nrriri/v- „_ ^ 



2. Wing with only one or two quills cut out on 'i^ ^ \\\tii ii£dr-7 



inner webs. 



Fig. 214. 



rry-~. 3. Nostril circular, witli conspicuous bony tubercle. 



Falco, p. 16-" 



Fig. 215. 3 . Nostril not circular, without bony tubercle. 



4. Tail deeply forked. 



Elanoides, p. 148. 



Fig. 216. 

 4'. Tail not deeply forked. 

 Fig. 217. 5. Tarsus minutely scaled in front . . Elanus. p. 148. 



5. Tarsus coarsely scaled in front 

 Ictinia, p. 149. 

 2. Wing with three to five quills cut out on inner 

 webs. 

 3. Face with owl-like ruff of stiff feathers. Fig. 218. 



Circus, p. 150. 

 3'. Face without owl-like ruff' of stiff feathers. 



4. Legs feathered to toes Archibuteo, p. 162. 



4'. Legs not feathered to toes. 



^^^ 5. Nostrils oblique and linear, slanting forward to cut- 

 ting edge of bill Polyborus, p. 171. 



. Nostrils not oblique or linear. 



6. Tail decidedly more than two thirds as long as 

 wing. 

 7. Lores nearly naked . . . Parabuteo. p. 154. 

 7. Lores densely feathered Accipiter. p. 151. 



(> . Tail not more tliaii two third.s as long as wing. 

 7. Primaries exceeding secondaries by less than 

 naked front of tarsus . Urubitinga. p. 1( 

 7. Primaries exceeding secondaries by much more 

 than naked front <tf tarsus. 

 8. Adults with under parts barred gray and 

 white ; wing less than four times iis long as 



tarsus Asturina. p. 1(51. 



8'. Adults with under parts iidt barred gray and 

 white : wing more than four times .is long as 

 tarsus Buteo. i». l.")5. 



