HORNED OWLS, ETC. 175 



FAMILY BUBONIDiE: HORNED OWLS, ETC. 



KEY TO GENERA. 



Small, wing O.40-T.50. 



'1. Witli ear tufts (inconspicuous in young) . Megascops, p. 181. 



2'. Without ear tufts. 



3. Tarsus more than twice as long- as middle toe. Speotyto, p. 189. 

 3'. Tarsus less than twice as long as middle toe. 



4. Tarsus scantily haired Miciopallas, p. 191. 



4'. Tarsus densely feathered. 



5. Ear openings very large, the two unlike. 



Nyctala, p. 179. 



Fig. 241. 



5'. Ear openings small, the two alike. 



Glaucidium, p. 190. 

 1'. Large, wing 1 1.50-19.00. 



3. Ear openings small Bubo, p. 18.5. 



Fig. 242. 3'. Ear openings large, reaching almost to top of skull. 



Asio, p. 175. 

 2'. Without ear tufts. 



B. Wing 9 inches Surnia, p. 188. 



3'. Wing 12 to 19. 



4. Ear openings small, the two ears not distinctly dif- 

 ferent Nyctea, p. 187. 



4'. Ear openings very large, the two strikingly dif- 

 ferent. 

 5. Toes feathered to claws. . Scotiaptex. p. 179. 

 5'. Tips of toes exposed . . . Syriiium, p. 177. 



GENUS ASIO. 



(ipueral Characters. — Ear openings immense, almost equal to height of 

 skull ; ear tufts more or less developed ; wings about twice Jis long as tail ; 

 feet closely feathered to ends of toes. 



KEY TO ADULTS. 



1. Ear tufts short accipitrinus, p. 177. 



r. Kar tufts long wilsouianus, p. 175. 



366. Asio Wilsonianus (Xf^.s.s-.). Lon(;-eaki:i) Owl. 



Ear tufts dark l)i(iwn. ciiiispicuons; fac(- mainly yellowish brown; under 

 parts whitish and yellowish, with dark brown shaft streaks and hori- 

 zontal bars on belly : flanks yellowish brown, unspotted ; upper parts 



