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



GROUP 4. Wing, 13 to 15 inches long. 

 SECTION 1. Second primary, decidedly shorter than fourth. 



Under parts, white, barred and streaked with brown; toes, more 

 or less feathered. Strix varia. 



Barred Owl. 

 See No. 176. 



SECTION 2. Second primary, about equal in length to fourth. 



Two large, ear-like tufts of feathers above the eyes. 



Bubo virginianus, and races. 

 Great Horned Owl. 

 See Nos. 181, i8ia. 



SECTION 3. Second primary, decidedly longer than fourth. 



Short-eared Owl. 



Under parts, streaked; feet, thickly feathered. Asio flammeus. 



Short-eared Owl. 

 See No. 175. 



Under parts, white or buff white, more or less spotted; feet, nearly 

 bare; middle toe nail, with comb-like edge. Aluco pratincola. 



Barn Owl. 

 See No. 173. 



