34 



aa. Tarsus never fully feathered, 

 b. Eye above and back of ear. 



Three outer primaries abruptly narrowed, 



Woodcock. 

 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, Maksh Hawk. 



ee. Rump not white, 

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

 ff . Length 18 inches or over. 



Wing coverts more or less rufous, 



Red-shotjldeeed Hawk. 

 Wing coverts without rufous. 



Red-tailed Hawk. 

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

 with the front scales fused into a single smooth 

 plate.) 

 e. Length over 30 inches, Bald Eagle. 



ee. Length under 25 inches, 

 f . Length over 20 inches. Goshawk. 



ff. Length under 20 inches. 



Length 16-18 inches. Cooper's Hawk. 



Length 12-14 inches, Shaep-shinned Hawk. 

 ddd. Tarsus without plates, 

 e. Bill not notched or toothed, Fish Havtk. 



ee. Bill notched or toothed. 



Length over 21 inches, Gyrpalcon. 



Length 16-19 inches. Duck Hawk. 



Length 10-12 inches ; back not chestnut. 



Pigeon Hawk. 

 Length 10 inches ; back chestnut. 



Sparrow Hawk. 



