ORDER PASSERES. 347 



[B 159, C 17, R 23, C 28.] 



HAB. Western United States, from the eastern base of the Rocky 

 Mountains to the Pacific coast, south to Southern Mexico. 



768. Sialia arctica (SWAINS.). 



Mountain Bluebird. 



Erythaca (Sialia} arctica SWAINS. Fauna Bor. Am. II. 1831, 209, 



Pi- 39- 

 Sialia arctica NUTT. Man. Land B. 1834, 573. 



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



HAB. Western North America (chiefly the interior), from the west- 

 ern parts of the Plains to the Pacific, north to Great Slave Lake, 

 south to Mexico. 



