156 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Richardson's Owl. 



Saw-whet Owl. 



Wing, over 6.10; upper plumage, dark cinnamon brown, more or 

 less spotted with white; under parts, brown and white. 



Glaux funerea richardsoni. 

 Richardson's Owl. 

 See No. 178. 



SECTION 2. Toes, nearly bare, or but thinly feathered. 



Tarsus, thickly feathered ; head with two horn-like tufts of feathers ; 

 general plumage, sometimes gray, sometimes rufous brown, more or 

 less streaked and spotted. Otus asio. 



Screech Owl. 

 See No. 180. 



GROUP 2. Wing, 8.50 to n inches long. 



Primaries, dark brown, more or less marked with tawny brown; 

 head with ear tufts an inch or more long. Asio wilsonianus. 



American Long-eared Owl. 



See No. 174. 



Primaries, dark brown, more or less marked with pure white; 

 no horn-like tufts of feathers on head. Surnia ulula caparoch. 



American Hawk Owl. 

 See No. 183. 



