532 AVES. 



Getms i.—G\POGERA'^VS.—Illiger. 



Genetic Cliaracter. — Beak shorter than the head, thick, strong, hooked, 

 and bent from its base, somewhat arched and compressed at the point; with 

 •a cere at its origin ; nostrils within the cere, taleral, a little separated at the 

 base, oblong', open, and placed diagonally ; legs very long and slender ; tibia 

 feathered, tarsus very long, tapering downwards ; toes short, robust, and 

 warty below, the anterior one united at the base ; the hallux articulated on 

 the tarsus ; wings long, the first five quills longest, and nearly equal ; carpus 

 of the Avings armed with a blunt spur. 



Gypogeranus serpetitarius. — The Secretary, or Serpent Eater. Plate 

 xxvi*. fig. 9. Described, vol. iii. p. 69. 



Genus 6.-P0LYB0RUS.— Vieillot. 



Generic Character.— 'Be\x\i somewhat elongated, deep, compressed laterally, 

 ai.d strongly hooked at the tip of the upper mandible ; cere hispid, continued 

 over the cheeks and around the eyes ; nostrils narrow, eliptical, oblique, and 

 placed near the upper edge of the beak ; wings somewhat rounded, nearly 

 as long as the tail ; third and fourth quills longest ; legs long, naked, and 

 reticulated; claws of moderate length and curvature. 



Po/yborus vulgaris. — The Caracara Eagle. Plate xxvii. 6g. 1. Upper 

 parts blaekish-brown ; head black ; feathers capable of being elevated to a 

 crest ; neck, breast, and shoulders, brownish-gray, witli transverse wavy 

 bars of darker brown ; tail white, with undulated dusky bands, and a broad 

 black band at its tip ; beak blue at the base, horny colour at the tip ; iris 

 Iiazi'l; cere and cheeks dull red; legs yellow; claws black. Twenty-one 

 inches long. Inhabits Brazil. 



Genus 6.— HAnPYl A.— Cmier. 



Generic Cluiracter. — Beak much incurved ; upper mandible very thick at 

 the base, and continues straight for more than a third of its length, from 

 whence it suddenly curves downwards, and is much arched towards the point, 

 which is extremely sharp ; lower mandible, straight, short, and obtuse ; nos. 

 trils transverse and ovate ; wings very short, reaching only to the middle of 

 the tail ; tail rounded at its extremity ; legs partially feathered on their 

 upper part ; toes and talons very strong, 



Harpyia destrttctor. — The Great Harpy. Plate xxvii. fig. 2. Descri'ocd, 

 vol. iii. p. 63. 



Genus 7. — A QUILA. — Brisson. 



Generic Character. — Head much flattened above, which, with the neck, is 

 plumed ; eyes deeply sunk ; beak thick, powerful, and straight at its ba.se ; 

 somewhat angular above, and strongly hooked at the point; nostrils short, 

 and nearly circular ; cere hispid ; wings as long as the tail, with the third 

 and fourth quills the longest ; legs very strong, clothed with feathers to the 

 base ; toes robust, of moderate length, the outer one united to the middle ; 

 talons strong, incurved, and channelled on their under surface. 



Aguilafutvus.— The Golden Eagle. Plate xxvi. fig. .*?. Described, vol. iii. 

 p. 03. 



Geniis 8.— H A LI A ETUS.— Vieillot. 



Giiicric Character.— 'Ri^ge of the beak convex and couipicssed ; upper 



