ORDER PASSERES. 323 
767 a. Sialia mexicana bairdi Ripcw. 
Chestnut-backed Bluebird. 
Stalia mexicana bairdi Ripew. Auk, XI. April, 1894, 151, 157. 
[B 159, part, C 17, part, R 23, part, C 28, part.| 
Geoc. Dist.— Rocky Mountain district, south to northern Mexico. 
767 6. Sialia mexicana anabelze AnrTHony. 
San Pedro Bluebird. 
Sialia mexicana anabele ANTHONY, Proc. Cal, Acad. Sci. 2d 
Ser. II. Oct. 1889, 79. 
[B—, C—, R—, C—.] 
Groc. Dist.— San Pedro Martir Mountains, Lower California. 
768. Sialia arctica Swains. 
i Mountain Bluebird. 
Erythaca (Sialia) arctica Swatns. in Sw. & Ricu. Fauna Bor. 
Am. II. 1831, 209, pl. 39. 
[B 160, C 18, R 24, C 29.] 
Groc. Dist.— Western North America (chiefly the interior), from 
the western parts of the Plains to the Pacific, north to Great Slave 
Lake, south to northern Mexico. 
