TETRAONID^. 185 



e 1 . Tail more than two-thirds as long as wing; bill small and 

 weak, its depth at base less than length of middle claw. 



Callipepla. (Page 191.) 



e*. Tail less than two-thirds as long as wing; bill stouter, its 

 depth at base decidedly greater than length of middle 

 claw. 



f 1 . Head with a conspicuous crest of long narrow feathers 

 exceeding tarsus in length ; plumage of upper parts 

 plain olive ; wing more than 5.00. 



Oreortyx. (Page 190.) 



/ 2 . Head not conspicuously crested, or else with longest 

 feathers much shorter than tarsus ; plumage of upper 

 parts much varied with spots, bars, and other mark- 

 ings; wing less than 5.00. 

 g l . Head not distinctly crested... Colinus. (Page 186.) 



y*. Head distinctly crested Eupsychortyx?- 



c*. Tail much less than half as long as wing, the feathers soft, narrow at 

 tips, and hardly distinguishable from the coverts ; claws vfery large, 

 broad, and blunt, the middle one nearly as long as the exposed culmen. 

 Head with a full soft crest of blended feathers; sexes exceed- 

 ingly different in colors Cyrtonyx. (Page 193.) 



a 2 . At least upper half of tarsus feathered (usually feathered to toes) ; nasal fossae 

 densely feathered ; sides of toes pectinated in winter (the points deciduous in 

 summer) ; larger (wing more than 6.00). (Subfamily Tetraonince.') 

 b l . Legs feathered down to base of toes. 



c 1 . Tail longer than wings, graduated, the feathers narrow and pointed ; 



wing more than 10.00 Centrocercus. (Page 204.) 



c 2 . Tail shorter than wings, not graduated (or else extremely short, with 

 middle pair of feathers longer than rest), the feathers broad and 

 rounded, or nearly truncated, at tips ; wing less than 10.00. 

 d 1 . Tail about half as long as wing, graduated or much rounded. 



e l . Tail graduated, with middle pair of feathers projecting much 

 beyond the rest ; no tufts or other elongated feathers on 



neck k Pediocsetes. (Page 203.) 



e 1 . Tail rounded, middle pair of feathers not projecting beyond 

 rest; sides of neck with a conspicuous tuft of straight, 

 rather stiff feathers, and beneath these an inflatable air-sac. 



Tympanuchus. (Page 202.) 

 <P. Tail more than half as long as wing, rounded or nearly even ; no 



tufts, ruffs, or other conspicuous feathers on neck. 

 e 1 . Toes feathered ; tail less than two-thirds as long as wing ; 

 plumage becoming chiefly or entirely pure white in 

 winter Lagopus. (Page 198.) 



1 EupsycJiortyx GOULD, Mon. Odont. 1850, 15. Type, Tetrao cristatus LINN. 



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