322 CHECK-LIST OF NORTH AMERICAN BIRDS. 
Genus SIALIA Swainson. 
Sialia Swatns. Phil. Mag. I. May, 1827, 369. Type, Motacilla 
sialis LINN. 
766. Sialia sialis (Liyy.). 
Bluebird. 
Motacilla sialis Linn. 8. N. ed. 10, I. 1758, 187. 
Sialia sialis HALDEM. TREGO’s Geog. Penn. 1843, 77. 
[B 158, C 16, R 22, C 27.] 
Geroc. Dist.— Eastern United States to the eastern base of the 
Rocky Mountains, north to Manitoba, Ontario, and Nova Scotia, 
south, in winter, from the Middle States to the Gulf States and Cuba. 
Bermuda, resident. 
766 a. Sialia sialis azurea (SwaINs.). 
Azure Bluebird. 
Sialia agurea BAtRD, Rev. Am. B. July, 1884, 62. 
Sialia sialis var. azurea B. B. & R. Hist. N. Am. B. I. Jan. 1874, 
62. 
Pee Oe ay OS 
Groc. Dist.— Southern Arizona and eastern Mexico. 
767. Sialia mexicana occidentalis (Towns.). 
Western Bluebird. 
Sialia occidentalis Towns. Journ. Acad. Nat. Sci. Phila. VII. 
1837, 188. 
Sialia mexicana occidentalis Ripcw. Auk, XI. April, 1894, 151, 
154. 
[B 159, part, C 17, part, R 23, part, C 28, part.] 
Geroc. Dist.— Pacific coast, from British Columbia to southern 
California, east to western Nevada, and casually, during migrations, 
to New Mexico. 
