58 



Rap aces. — Diurnae. 



FALCONIBJE. 



Genus Falco. (Linnceus.) 



Sub-genus Aquila. (Brisson.) 



Sub-generic Characters — Beak strong, not bending suddenly 

 from its base; feet strong and sinewy; tarsi naked or covered 

 with feathers; toes strong, and armed with powerful and 

 much-curved claws. Wings long; the first, second, and third 

 quill feathers the shortest, the first short, the fourth and fifth 

 the longest. — Temminck. 



IMPERIAL EAGLE. 



Falco imperialis. 



Faleo imperialis, Temminck. Bechstein. 



Aquila imperialis, Cuviee. Gould. Scheegel. 



" heliaca, Savigny. Bonaparte. 



" mogilinik, Gmelin. Latham. Gray. 



Aigle de Thebes, Oe the French. 



Specific Characters. — Fire scales on the last joint of the middle 

 toe; only three or four, according to age, on the others. Some 

 of the scapularies white, or tipped with white. 



Measurement. — Length of adult male two feet six inches. 

 Length of adult female three feet. 



