ORDER PASSERES. 367 



Sialia mexicana SWAINSON. 



RANGE. Western North America from British Columbia south to 

 the highlands of Mexico. 



a. [Sialia mexicana mexicana. Extralimital.] 



b. Sialia mexicana occidentals J. K. TOWNSEND. Western Bluebird. [767.] 



Sialia occidentalis TOWNSEND, Journ. Acad. Nat. Sci. Phila., VII, ii, 1837, 

 188. (Plains of the Columbia River.) 



RANGE. Pacific coast. Breeds mainly in Transition Zone from southern 

 British Columbia east to northern Idaho and western Montana, and south 

 to the San Jacinto Mountains, southern California; winters south to the 

 San Pedro Martir Mountains, Lower California. 



c. Sialia mexicana bairdi RIDGWAY. Chestnut-backed Bluebird. [767a.] 



Sialia mexicana bairdi RIDGWAY, Auk, XI, April, 1894, 151, 157. (Cac- 

 tus Pass, 20 miles east of Kingman, Mojave Co., Arizona.) 



RANGE. Southern Rocky Mountain region. Breeds mainly in Transi- 

 tion Zone from Utah, Colorado, and western Texas south to Durango and 

 Zacatecas; winters from southern Utah and southern Colorado south to 

 Sonora and Zacatecas; accidental in Iowa. 



d. Sialia mexicana anabeiae ANTHONY. San Pedro Bluebird. [7676.] 

 Sialia mexicana anabelcB ANTHONY, Proc. Calif. Acad. Sci., ser. 2, II, Oct., 



1889, 79. (San Pedro Martir Mountains, Lower California.) 



RANGE. Mountains of southern California and northern Lower California. 

 Breeds mainly in Transition Zone from the mountains of southern Los Angeles 

 County to the San Pedro Martir Mountains. 



Sialia currucoides (BECHSTEIN). Mountain Bluebird. [768.] 



Motacilla s. Sylvia currucoides BECHSTEIN, in LATHAM, Allg. Ueb. Vogel, 

 III, ii, 1798, 546, pi. 121. (" Virginien.") 



RANGE. Western North America. Breeds in Canadian and 

 locally in upper Transition Zone from southern Yukon, northwestern 

 British Columbia, central Alberta, central Saskatchewan, and south- 

 western Manitoba south to mountains of Arizona, New Mexico, and 

 Chihuahua, and from the Cascade Range and Sierra Nevada to south- 

 western North Dakota and western Nebraska; winters from Cali- 

 fornia and Colorado south to Guadalupe Island, Lower California, 

 and Sonora, and east to Kansas, Oklahoma, and Texas; casual at 

 Great Slave Lake; accidental at Fort Franklin, Great Bear Lake. 



