FALCONID^ 265 



a\ Middle toe elongated ; without 

 claw more than twice the 

 length of the culmen without 



cere Acci'piter, p. 347. 



h\ Middle toe without claw equal to 

 or less than twice the length 

 of the culmen without cere ... Astur, p, 354. 

 h. Tibia much longer than the tarsus, always 

 exceeding it by more than the length of 

 the hind claw. 

 «'. Lores clothed with bristles. 

 a-. Tarsus feathered to the toes. 



a^. Nostrils concealed by bristles ; a 



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



b^. Nostrils 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 Lo^j 7(Orte7?/s, p. 307. 



b*. Crest if present small. 



«•''. Wings short and rounded, dif- 

 ferences between the length 

 of the primaries and second- 

 aries hardly noticeable Sjiizaetus, p. 303. 



6\ Wings long and pointed, dif- 

 ference between the primaries 

 and secondaries exceeding the 

 length of the tarsus. 

 a^. Eidge of the culmen equal to 



the inner toes without claw Eiitolmaetus, p. 298. 

 b'\ 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. 



b^. Tarsus never with transverse scutes 

 behind. 

 a^. Nostrils rounded with central 

 bony tubercle ; tarsus with 



transverse scutes in front Asterinula, p. 327. 



b\ Nostrils oblique ovals ; tarsus 

 covered with polygonal scales 



thoughout CtrcfleYz/s. p. 322. 



c^ Nostrils rounded ; tarsus with 

 transverse scales in front ; tail 

 forked Milvus, p. 335. 



