STKIGID^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 &quot; ear-tufts ;&quot; iris yellow. 

 \. Tail about f 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. . . . OTUS, 2. 

 ff Head without evident &quot; ear-tufts.&quot; 



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

 12 - NYCTALE, 4. 



5&. 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 of wing ; bill yellow ; iris yellow ; length 



about 16 SURNIA, 8. 



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

 claw simple SPEOTYTO, 9. 



/. STRIX, Linmeus. 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. 5J. U. S., rather southerly. 



2. OTUS, Cuvier. EARED OWLS. 



1. 0. vulgaris, (L.) var. wilsonianus, (Less.) Allen. 

 LONG -EARED OWL. Ear tufts well developed, of 8 to 



