ORDER PASSERES. 323 



767 a. Sialia mexicana bairdi Ridgw. 

 Chestnut-backed Bluebird. 



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



[B \i,(), part, C \'],part, R 22,, part, C 28, /ar/.] 



Geog. Dist. — Rocky Mountain district, south to northern Mexico. 



767 d. Sialia mexicana anabels Anthony. 

 San Pedro Bluebird. 



Sialia mexicana anabelce Anthony, Proc. Cal. Acad. Sci. 2d 

 Ser. II. Oct. 1889, 79. 



[B— ,C— , R— , C— .J 



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.J 



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. 



