EXPLANATION TO PLATE XJI. 



Fig. 1. Strix pratincola, Bonaparte. American Barn Owl. 



Fig. 2. Asio wilsonianus, Lesson. American Long-eared Owl. 



Pig. 3. Asio accipitrinus, Pallas. Short-eared Owl. 



Pig. 4. Syrnium nebulosum, Porster. Barred Owl. 



Pig. 5. Scotiaptex cinerea, Gmelin. Great Gray Owl. 



Pig. 6. Nyctala tengmalmi richardsoni, Bonaparte. Richardon's Owl. 



Pig. 7. Nyctala acadica, Gmelin. Saw-whet Owl. 



Pig. 8. Megascops asio, Linnaeus. Screech Owl. 



Pig. 9. Megascops asio macfarlanei, Brewster. MacParlane's Screech Owl. 



Pig. 10. Megascops asio maxwelliae, Bidgway. Rocky Mountain Screech Owl. 



Pig. 11. Megascops asio trichopsis, Wagler. Mexican Screech Owl. 



Pig. 12. Bubo virginianus, Gmelin. Great Horned Owl. 



Pig. 13. Micropallas whitneyi, Cooper. Elf Owl. 



Pig. 14. Speotyto cunicularia hypogaea, Bonaparte. Burrowing Owl. 



Pig. 15. Megascops flammeolus, Kaup. Plammulated Screech Owl. 



Pig. 16. Speotyto cunicularia fioridana, Ridgway. Florida Burrowing Owl. 



Pig. 17. Glaucidium phalsenoides, Daudain. Ferruginous Pigmy Owl. 



Pig. 18. Surnia ulula caparoch, Miiller. American Hawk Owl. 



Pig. 19. Nyctea nyctea, Linnaeus. Snowy Owl. 



