ORDER PASSERES. ! urdidac 367 
Sialia mexicdna SWAINSON. 
Rance.— Western North America from British Columbia south to 
the highlands of Mexico. 
a. ([Sialia mexicana mexicana. Extralimital.] 
b. Sialia mexicana occidentalis J. K.Townsenp. Western Bluebird. [767.] 
Sialia occidentalis TOWNSEND, Journ. Acad. Nat. Sci. Phila., VII, ii, 1837, 
188. (Plains of the Columbia River.) 
Rance.— 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 Ringway. Chestnut-backed Bluebird. [767a.] 
Sialia mexicana bairdt Ripaway, Auk, XI, April, 1894, 151, 157. (Cac- 
tus Pass, 20 miles east of Kingman, Mojave Co., Arizona.) 
Rance.— 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 anabéle ANnTHoNny. San Pedro Bluebird. [7675.] 
Sialia mexicana anabele ANTHONY, Proc. Calif. Acad. Sci., ser. 2, IT, Oct., 
1889, 79. (San Pedro Martir Mountains, Lower California.) 
Rance.— 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, pl. 121. (‘‘ Virginien.’’) 
RanceE.— 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. 
