550 CLASS XVI. 



Sp. Astur harpyia, Vulturharpyia'L., Falco destructor DAUD., Cuv. R. Ani. 

 PL in. fig. 3, TEMM., PI. col. 14, LESS. Ornith. PL 10, u, fig. j ; more 

 than three feet in size ; bill black, legs yellow, a crest of black feathers at 

 the back of the head, back and wings black, belly and breast white, a 

 narrow black ring round the neck; in South America. 



Circaetus VIEILL. Bill shorter than head, curved; upper man- 

 dible with margin sinuate, tip hooked. Nostrils oblique or longi- 

 tudinal, oval. Wings with second and third quills subequal, longest 

 of all. Tail long, even. Tarsi long, plumed below the heel, else- 

 where reticulate with hexagonal scales. Toes reticulate, scutellate 

 above the base of claws, outer toes conjoined by membrane. Claws 

 curved, grooved beneath. 



Sp. Circaetus gatticus, Falco gatticus GM., Aquila brachydactylaWoLF, BUFF. 

 PL enl. 413, NAUMANN, Taf. 15, SUSEM. Vog. Eur. Taf. 35 a., South of 

 Europe, Egypt, Arabia ; Circaetus cinereus VIEILL., funereus RUEPPELL, 

 VIEILL. Gal. PL 12, KUEPPELL Faun. Abyss. Tab. 14; Circaetus holo- 

 spilus (Buteo Iwlospilus VIGORS), GRAY Gener. PL vn. These birds are 

 placed by some writers with the genus Buteo, with which they have some 

 analogy. 



Spilornis GRAY, KAUP. Sp. Falco bacha DAUD., Falco albidus Cuv., 

 TEMM. PL col. 19. 



Herpetotheres YIEILL. 



Sp. Circaetus cachinnans, Falco cachinnans L., VIEILL. Gal. PL 19; 

 Circaetus brachypterus (Micrastur GRAY), TEMM. PI. col. 141, 116. 



Gymnogenys LESSON, Polyboro'ides (!) SMITH, GRAY. 



Poliomis KAUP, GRAY. Tarsi covered anteriorly with a row of 

 larger scales or small scutes. Tail rounded. Wings reaching 

 nearly to the end of tail. 



Sp. Circaetus liventer, Fako liventer TEMM. PL col. 438, Timor; Circaetus 

 poliogenys, Falco poliogenys TEMM. PI. col. 325 ; from the eastern parts 

 of Asia, also at Japan. 



Aquila BRISS., Cuv. Bill shorter than head or moderate, curved 

 (straight at the base, arched downwards toward the tip). Upper 

 mandible with margin sinuate. Nostrils oblique, oblong. Wings 

 with fourth and fifth quills subequal, longest of all. Tail mode- 

 rate or long, graduated or rounded. Tarsi long, hirsute to the 

 toes. Toes reticulate with scales, scutellate above the base of 

 claws; outer toes connected at the base by membrane. 



Sp. Aquila chrysaetos Cuv., Falco fulvus and Falco ckrysaetos L., BUFF. PL 

 enl. 409, 410, NAUM. Taf. 8, 9, SUSEM. Vog. Eur. Taf. 16, 17, Cuv. R. Ani., 



