VI BULLETIN 17 0, UNITED STATES NATIONAL MUSEUM 



Family Strigidae — Continued. Page 



Bubo virginianus lagophonus: Northwestern horned owl 345 



Habits 345 



Bubo virginianus occidentalis: Montana horned owl 348 



Habits - 348 



Nyctea nyctea: Snowy owl 358 



Habits 358 



Distribution 371 



Surnia ulula pallasi: Siberian hawk owl 374 



Habits 374 



Surnia ulula caparoch: American hawk owl 375 



Habits 375 



Distribution 382 



Speotyto cunicularia hypugaea: Western burrowing owl 384 



Habits 384 



Distribution 394 



Speotyto cunicularia floridana: Florida burrowing owl 396 



Habits 396 



Glaucidium gnoma pinicola: Rocky Mountain pygmy owl 401 



Habits 4Q1 



Distribution 408 



Glaucidium gnoma calif ornicum: California pygmy owl 410 



Habits 410 



Glaucidium gnoma swarthi: Vancouver pygmy owl 428 



Habits 428 



Glaucidium gnoma grinnelli: Coast pygmy owl 430 



Habits 430 



Glaucidium gnoma hoskinsi: Hoskins's pygmy owl 434 



Habits 434 



Glaucidium brasilianum ridgwayi: Ferruginous pygmy owl 435 



Habits 435 



Distribution 438 



Micropallas whitneyi whitneyi: Whitney's elf owl 438 



Habits _. 438 



Distribution 443 



Micropallas whitneyi idoneus: Texas elf owl 444 



Habits 444 



Micropallas whitneyi sanfordi: Sanford's elf owl 444 



Habits 444 



Literature cited 445 



Index 467 



