PALCONTD^. 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. virgin/anus, (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. scandiaca, (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. (N. 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. 



(Tlie 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 



