FALCONIDJ3 



265 



a 4 . Middle toe elongated ; without 

 claw more than twice the 

 length of the culmen without 



cere 



b 4 . Middle toe without claw equal to 



or less than twice the length 



of the culmen without cere ... 



ft. Tibia much longer than the tarsus, always 



exceeding it by more than the length of 



the hind claw. 



fi } . Lores clothed with bristles. 

 -. Tarsus feathered to the toes. 



a 3 . Nostrils concealed by bristles ; a 



tuft of bristles on the chin 



I 3 . Nostrils not so concealed, no bristles 



on the chin. 



a 4 . An occipital crest of long feathers 

 whose length exceeds the dis- 

 tance by which the wings fall 



short of the tail 



b*. Crest if present small. 



a\ Wings short and rounded, dif- 

 ferences between the length 

 of the primaries and second- 

 aries hardly noticeable 



ft-' 1 . Wings long and pointed, dif- 

 ference between the primaries 

 and secondaries exceeding the 

 length of the tarsus. 

 a^ 6 . Kidge of the culmen equal to 

 the inner toes without claw 

 ft 6 . Eidge of the culmen longer 

 than the inner toe without 



claw 



ft ? . Lower portion of the tarsus bare. 

 a 3 Tarsus covered behind and in front 



by transverse scutes 



ft 3 . Tarsus never with transverse scutes 



behind. 



a 4 . Nostrils rounded with central 

 bony tubercle ; tarsus with 



transverse scutes in front 



ft 4 . Nostrils oblique ovals; tarsus 

 covered with polygonal scales 



thoughout 



c 4 . Nostrils rounded ; tarsus with 

 transverse scales in front ; tail 

 forked.. 



Accipiter, p. 347. 

 Astur, p. 354. 



Gypaetus, p. 320. 



Lophoaetus, p. 307. 



Spizaetus, p. 303. 



Eutolmaetus, p. 298. 

 Aquila, p. 291. 

 Butco, p. 329. 



Asterinula, p. 327. 

 Circaeiua, p. 322. 

 Milvus, p. 335. 



