HORNED OWLS, ETC. 175 



FAMILY BUBONIDiE: HORNED OWLS, ETC. 



KKV TO (iKMERA. 



1. Small, wino- ;;.4()-T..".0. 



2. With ear tufts (iueoiispiciiuiis in young) . . Megascops, p. 181. 

 2'. Witliout ear tufts. 



8. Tarsus more than twice as long- as middle toe. SpeotytO, p. 189. 

 ;]'. Tarsus less than twice as long- as middle toe. 



4. Tarsus seantil\ haired Micropallas. p. 191. 



4'. Tarsus densely feathered. 



5. Ear openings very larg-e, the two unlike. 



Nyctala. p. 179. 



Fig. -241. 



o'. Ear openings small, the two alike. 



Glaucidium. p. ll»(t. 

 1. Large, ^ving• 11. 50-1 9.00. 



M 



With ear tufts. 



Ear oi)enings small Bubo, p. IS."). 



Fig. 24'J. o'- Ear openings large, reaching- almost to top of skull. 



Asio. p. l7o. 

 2'. Without ear tufts. 



;;. Wing 9 inches Suriiia, p. 188. 



:}'. Wing 12 to 19. 



4. Ear openings snudl. the two ears not distinctly dif- 

 ferent . Nyctea, p. 187. 



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

 ferent. 

 ."). Toes feathered to claws. . Scotiaptex. p. 179. 

 .")'. Tips of toes exposed . . . Syrnium. p. 177. 



GENUS ASIO. 



(it'iicrdl (Hidniili IS. — Ear openings immense, almost equal to height of 

 skull ; eai- tufts more or h'ss (h'veloped ; wings about twice as long as tail : 

 feet closely feathered to ends of toes. 



KEY TO ADULTS. 



1. Ear tufts short ' accipitiinus. j). 177. 



r. Kar tufts hmg -wilsoiiianus. j). 17."». 



366. Asio wilsonianus (Lrs^.). Lon<;-k.m:i:i> 0\\\.. 



V..iv tufts dark hn.wn. conspicuous; face maiidy yellowish hrowu : undt-r 

 parts whitish and yellowish, with dark l)rown shaft streaks and hori- 

 zontal bars on Ixdly : Hanks yellowish brown, unspotted; upper parts 



