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BIRDS OF PENNSYLVANIA. 



GENUS SIALIA. SWAINSON. 

 7B6. Sialia sialis (LiNN.). 



Bluebird. 



DESCRIPTION. (Plate so.) 



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 blue ; throat, breast and sides reddish brown ; abdomen, anal region and 



