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, 



pl- 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. 



