FALCONID^ 265 



a'. Middle toe elongated ; without 

 claw more than twice the 

 length of the oulmen without 



cere Acoipiter, p. 847. 



6^ Middle toe without claw equal to 

 or less than twice the length 

 of the culmen without cere ... Astur, ip. SM. 

 . Tibia much longer than the tarsus, always 

 exceeding it by more than the length of 

 the hind claw, 

 a'. Lores clothed with bristles. 

 a^. Tarsus feathered to the toes. 



a'. Nostrils concealed by bristles ; a 



tuft of bristles on the chin Oypaetus, p. 320. 



6'. NostrUs not so concealed, no bristles 

 on the chin. 

 a*. An occipital crest of long feathers 

 whose length exceeds the dis- 

 tance by which the wings fall 



short of the tail LopJioaeius, p. 307. 



hK Crest if present small. 



a*. Wings short and rounded, dif- 

 ferences between the length 

 of the primaries and second- 

 aries hardly noticeable Spizaehis, ip. 303. 



b'. Wings long and pointed, dif- 

 ference between the primaries 

 and secondaries exceeding the 

 length of the tarsus. 

 a''. Bidge of the culmen equal to 



the inner toes without claw Eutolmaetus, p. 298. 

 5^. Eidge of the culmen longer 

 than the inner toe without 



claw Aquila, p. 291. 



b-. Lower portion of the tarsus bare, 

 a' Tarsus covered behind and in front 



by transverse scutes Buteo, p. 329. 



V. Tarsus never with transverse scutes 

 behind, 

 a*. Nostrils rounded with central 

 bony tubercle ; tarsus with 



transverse scutes in front Asterinula,^.3'il. 



b*. Nostrils oblique ovals; tarsus 

 covered with polygonal scales 



thoughout Circaetus, p. 322. 



c*. Nostrils rounded; tarsus with 

 transverse scales in front ; tail 

 forked Milvua, ■^.335. 



