FALCONID^J. XLV. 109 



plumage bearing no relation to age, sex or season; L. 

 10; W. 7; T. 3. U. S., abundant. 



6. BUBO, Dumeril. GREAT HORNED OWLS. 



1. B. virginianus, (Gm.) Bon. GREAT HORNED OWL. 

 Black, gray and buffy, variously mottled and barred; 

 usually a whitish half-collar; ear tufts large, their feathers 

 mostly black; L. 22; W. 16; T. 10. U. S., abundant; 

 one of the strongest and most untamable of the Owls. 



7. NYCTEA, Stephens. GREAT SNOW OWLS. 



1. N. scand/aca, (L.) Newt. SNOWY OWL. Pure 

 white, more or less barred with blackish; L. 23; W. 17; 

 T. 10. Northern, S. in Winter; one of the handsomest 

 of Owls. (IV. nivea^ Auct.) 



8. SURNIA, Dumeril. HAWK OWLS. 

 1. S. ulula, (L.) Bon., var. hudsonica, (Gm.) Ridg. 

 HAWK OWL. DAY OWL. Brown, much speckled and 

 barred; L. 16; W. 9; T. 7. Northern, S. to Wis. and 

 Mass. 



9. SPEOTYTO, Gloger. BURROWING OWLS. 



1. S. -cunicularia, (Mol.) var. hypogcea, (Bon.) Coues. 

 BURROWING OWL. Brownish, much spotted and varie 

 gated. L. 10; W. 7|; T. 4. Fla. and Western Plains, 

 living in the holes of prairie dogs. 



FAMILY XLV. FALCONID^E. 



(The Falcons.) 



Eyes lateral, eyelids provided with lashes, usually a 

 projecting bony eyebrow; no complete facial disk. Toes 

 always naked, and usually tarsus also ; hind toe not 

 elevated. Head fully feathered (except in the Old World 



