STBIGID^E. 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. . STRIX, 1. 

 ** Tarsus fully feathered, 

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

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



BUBO, 6. 



\\ 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 SYRNIUM, 3. 



bbb. Tail about f of wing ; bill yellow ; iris yellow ; length 



about 16 * SURNIA, 8. 



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

 claw simple SPEOTYTO, 9. 



/. STRIX, Linnaeus. BARN OWLS. 



1. S. flammea, (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, Cuvier.) 



1. A. otus, (L.) Less. LONG - EARED OWL. Ear 

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



