TKTRAOMD.E. 185 



e'. Tail more tlum two-tliirds as long as wing; bill .small and 

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



Callipepla. (Page 191.) 



e'. Tail Ies8 than two-thirds as long as wing ; bill stouter, its 



dejJth at base decidedly greater than length of middle 



claw. 



/'. 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 I'M).) 

 f. 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. 

 (/'. Head not distinctly crested... Colinus. (Page 186.) 



g''. Head distinctly crested Eupsychortyx} 



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



tips, and hardlj' distinguishable from the coverts; claws very large, 



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



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



ingh- diflerent in colors Cyrtonyx. (Page 193.) 



n'. At least upper half of tai-sus feathered (usually feathered to toes) ; nasal fosste 

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

 summer); larger (wing more than G. 00). (Subfamily Tetraonina'.) 

 bK Legs feathered down to base of toes. 



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



wing more than 10.00 Centrocercus. (Page 204.) 



c'. 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\ Tail about half as long as wing, graduated or much rounded. 



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

 beyond the rest ; no tufts or other elongated feathers on 



neck Pediocaetes. (Page 203.) 



e'. Tail rounded, middle pair of feathers not projecting bej-ond 



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



rather stiff feathers, and beneath those 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'. Toes feathered; tail less than two-thirds as long as wing; 



plumage becoming chiefly or entirely pure white in 



winter Lagopus. (Page 198.) 



• Eup»ychorli/z Gould, Mon. Odont. IS.iO, 15. Typo, Tttiao critladu LiNX. 

 24 



