156 Field Museum of Natural History — Zoology, Vol. IX. 



Richardson's Owl 



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

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



Glaux jnnerea 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 11 inches long. 



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

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



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 iilula caparoch. 



American Hawk Owl. 



See No. 183. 



