CHE STXTJT- BACKED BLUEBIRD 265 



Peak, Ribera, Capitan Mountains, and Cloudcroft) ; western Texas 

 (Guadalupe Mountains and Davis Mountains); southern Coahuila 

 (Carneros); western Tamaulipas (Miquihuana) ; western Veracruz 

 (Las Vigas and Cofre de Perote); and eastern Puebla (Tochimilco). 

 South to Puebla (Tochimiho); Morelos (Huitzilac) ; and Michoacan 

 (Mount Tancitaro). West to western Michoac&n (Mount Tancitaro 

 and Mount Patamban); southern Durango (El Salto); western 

 Chihuahua (Colonia Garcia) ; northern Sonora (San Luis Mountains) ; 

 central northern Lower California (Sierra San Pedro Martir, El Rayo, 

 and 20 miles east of Ensenada) ; the Coast Range and sometimes the 

 coast of California (San Diego, Los Angeles, Santa Barbara, Monterey, 

 Nicasio, and Humboldt Bay) ; Oregon (Gold Beach, Elkton, Newport, 

 and Olney) ; Washington (Aberdeen, the Olympic Mountains, and 

 Mount Vernon) ; and southwestern British Columbia (Vancouver 

 Island; Alberni and Beaver Creek). 



Winter range. — Through much of its range the species is resident or 

 only retires to lower altitudes in winter. It winters north to southern 

 British Columbia (Comox, Chilliwack, and the Okanagan Valley) ; to 

 the valleys of the Cascades in Washington (Bellingham and Dungeness 

 Spit, occasional at Spokane) ; Oregon (Portland, Salem, and Corvallis) ; 

 eastern California (Lassen Peak region); western and southern 

 Nevada (Carson City and Searchlight) ; Arizona (south rim of Grand 

 Canyon, Salt River, and Tucson) ; central New Mexico (Socorro, 

 Albuquerque, and Las Vegas); and southwestern Texas (Frijoles, 

 Marathon, and Fort Clark). In migration, possibly occasionally in 

 winter, it has been found as far east as Kerrville, Tex. There is one 

 record of occurrence in winter near Poison, Mont., near the south, 

 end of Flathead Lake. 



The ranges as outlined are for the species as a whole, which has been 

 divided into several subspecies or geographic races. The chestnut- 

 backed bluebird (S. m. bairdi) breeds from Utah and Colorado south 

 to Durango and Zacatecas; the western bluebird (S. m. occidenialis) 

 breeds from southern British Columbia and western Montana south to 

 southern California; the San Pedro bluebird (S. m. anabelae) breeds in 

 the Sierra San Pedro M&rtir and the Sierra Juarez of northern Lower 

 California. 



Migration. — Some early dates of spring arrival are: Colorado — 

 Colorado Springs, March 4. Wyoming — Yellowstone Park, March 13. 

 Montana — For tine, March 9. Utah — Salt Lake City, March 6. 

 Idaho — Rathdrum, March 3. 



Some late dates of fall departure are: Idaho — Meridian, October 27. 

 Utah — Kanab, October 21. Montana — Fortine, October 28. Wyo- 

 ming — Yellowstone Park, September 8. Colorado — Beulah, October 

 24. 



792825 — 49 18 



