4 
-Ortyax, Stevens. Bill short, very high ; the culmen:‘con- 
STRUTHIONIDE. | 345 
siderably elevated and curved: the tip hooked: the 
gonys thick and ascending. Nostrils large, naked. 
Tarsus smooth. Lateral toes unequal; hinder toe 
none. Tail moderate. America only. 
O. Borealis. Wil. 47. f. 2. malurus. Spix, 1. pl. 76. a. 
-Cryprurus, Ill. Tinnamou. Bill slender, weak, length- 
ened, as long as the head. The base of the culmen 
broad and flattened. Nostrils very long; the aper- 
ture naked. Gonys excessively short. Feet smooth. 
Inner toe shortest. Tropical America. 
Crypturus. Bill slightly depressed. The aperture of the 
nostrils large, oval, and placed in the middle of the 
bill. Tail feathers firm, but concealed and con- 
founded with the upper covers. Hind toe minute, 
not longer than its claw. 
C. lepidotus. Zool. Ll. i. pl. 19. serratus. Spix, pl. 76. 
Nothurus, Wagler. Bill very wide at the base. Frontal 
feathers advancing to the aperture of the nostrils. 
Tail feathers none; the upper covers soft and loose. 
Hinder toe longer than its claw. 
N. rufescens. Spix, pl. 76.a. minor. Sp. pl. 82. P. C. 316. 
Pl. Col. 412. maculosus. Spix, pl. 80. 
Famity STRUTHIONIDE. Ostrich. 
Stature very large. Wings short. Often incapable of 
flight. 
Oris, Linn. Bustards. Bill short, straight ; the base de- 
pressed ; the sides compressed and conic. Feet long, 
naked above the knee. Toes three, directed forwards, 
short, with a connecting membrane. Wings mode- 
rate ; the third quill longest. 
O. tarda. Pl. Enl. 245. 
Srrutuio. Ostriches. Wings abortive. Bill much de- 
pressed. | 
Struthio, Antiq. True Ostrich. Wings short. Head naked. 
Feet with only two unequal toes, placed in front. 
S. camelus. Pl. Enl. 457, 
