BLUEBIRD. 

 766. Sialia sialis. 7 inches. 



These beautiful, gentle and well known birds spend 

 the winter in the southern parts of the United States 

 and north to the snow line; some more hardy than 

 the rest are found throughout the winter in southern 

 New England. 



Call. A short sweet warble; song, a continued 

 warbling. 



Nest.- In holes in trees, particularly in orchards, 

 in bird boxes or crannies about the buildings. The 

 bottom of the cavity is lined with grasses for the 

 reception of the four or five pale bluish eggs, which 

 measure (.84 x .62). 



Range. Eastern United States, breeding from the 

 Gulf to New Brunswick and Manitoba; winters 

 chiefly in the southern parts of the United States. 

 766a. Azure Bluebird (azurea) is found in the moun- 

 tains of eastern Mexico and north casually to south- 

 ern Arizona. It is paler both above and below than 

 our eastern bird. 



