ORDER PASSERES. 323 



767 a. Sialia mexicana bairdi RIDGW. 



Chestnut-backed Bluebird. 



Sialia mexicana bairdi RIDGW. Auk, XI. April, 1894, 151, 157. 



[B i59,/*rf, C 17,/arf, R 23, part, C 28, part.} 

 GEOG. DIST. Rocky Mountain district, south to northern Mexico. 



767 . Sialia mexicana anabelae ANTHONY. 



San Pedro Bluebird. 



Sialia mexicana anabela ANTHONY, Proc. Cal. Acad. Sci. 2d 

 Ser. II. Oct. 1889, 79. 



[B C R C .] 

 GEOG. DIST. San Pedro Martir Mountains, Lower California. 



768. Sialia arctica SWAINS. 



Mountain Bluebird. 



Erythaca (Sialia) arctica SWAINS, in Sw. & RICH. Fauna Bor. 

 Am. II. 1831, 209, pi. 39. 



[B 160, C 18, R 24, C 29.] 



GEOG. 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. 



