34 



aa. Tarsus never fully feathered, 

 b. Eye above and back of ear. 



Three outer primaries abruptly narrowed, 



A\''00DC0CK. 



Outer primaries not narrowed, Wilson's Snipe. 

 bb. Eye in front of ear. 

 c. Bill hooked ; base covered with a thick skin, 

 d. Tarsus covered with plates in front and behind, 

 e. Rump pure white, Marsh Haw^k. 



ee. Rump not white 

 f. Length 17 inches or less, Bkoad-winged Hawk. 

 ff . Length 18 inches or over. 



Wing coverts more or less rufous. 



Red-shouldered Hawk. 

 Wing coverts without rufous, 



Red-tailed Hawk. 

 dd. Tarsus with platesonly in front, or "booted" (i. e. 

 with the front scales fused into a single smooth 

 plate.) 

 e. Length 'over 30 inches, 

 ee. Length under 25 inches, 

 f . Length over 20 inches, 

 ff. Length under 20 inches. 

 Length 16-18 inches. 

 Length 12-14 inches, Sha 

 ddd. Tarsus without plates, 

 e. Bill not notched or toothed, 

 ee. Bill notched or toothed. 

 Length over 21 inches. 

 Length 16-19 inches. 

 Length 10-12 inches; back 



Bald Eagle. 



Goshawk. 



Cooper's Hawk. 

 KP-sHiNNED Hawk. 



Eish Hawk. 



Gyrfalcon. 

 Duck Hawk. 

 not chestnut, 



Pigeon Hawk. 

 Length 10 inches ; back chestnut. 



Sparrow Hawk. 



