STlilGID^. — XLIV. 107 



wide range. Their habits are so well known that I need 

 not dwell upon them here. Genera about forty; species 

 one hundred and fifty. 



* Tarsus naked or scant - feathered, facial disk perfect; no ear- 

 tufts; middle claw pectinate; iris black. . Aluco, 1. 

 ** Tarsus fully feathered, 

 f Head with evident "ear-tufts;" iris yellow. 



X Tail about f of wing ; bill blackish ; length more than 18. 



Bubo, 6. 

 Xt Tail about half length of wing ; length less than 18. 

 a. Bill pale ; length less than 12. . . . Scops, 5. 

 aa. Bill dark ; length more than 12. . . . Asio, 2. 

 ft Head without evident " ear-tufts." 



b. Tail about i length of wing; iris yellow; length less than 

 12 Nyctale, 4. 



bb. Tail about f of wing ; length 18 or more. 



c. Pure white, with dark markings ; toes concealed by long 

 feathers ; facial disk incomplete ; bill black ; iris yellow. 



Nyctea, 7. 



cc. Grayish, much barred ; facial disk complete ; bill yellow ; 

 iris black or yellow Strix, 3. 



&66. Tail about f of wing; bill yellow; iris yellow; length 

 about 16 SuKNiA, 8. 



*** Tarsus long, sparsely bristly; fecial disk imperfect; middle 

 claw simple Speotyto, 9. 



/. ALUCO, Fleming. Barn Owls. 



1. A.f/ammeus,(L.) var. pratincola, (Bon.) Ridg. Barn 

 Owl. Face elongated; reddish or tawny, much vari- 

 egated; L. 17; W. 13; T. 5|. U. S., rather southerly. 



2. ASIO, Brisson. Eared Owls. 



[Otus^ Cuviei'.) 



1. A. otus, (L.) Less. Long -Eared Oavl. Ear 

 tufts well developed, of 8 to 12 feathers; outer primary 



