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Birds of Pennsylvania. 



Genus SIALIA. Swainson. 



7<)(>. Sialia sialis (Linn.). 



Bluebird. 



Description. {Plate '>().) 



Length, about 6| ; extent, about 12| inches, bill and legs blackish ; iris brown. 

 Adult male in summer, upper parts uniform azure blue, sides of head and fore 

 part of chin lilue ; throat, breast and sides reddish brown ; abdomen, anal region and 



