46 

 from a gravel roof in the center of Philadelphia, hut it is 

 now practically unknown as a breeder in that locality. In 

 Chester and upper Montgomery Counties, it breeds, hut thru- 

 out most of southeastern Pennsylvania does not nest commonly. 

 Mr. Leibelsperger finds it breeding regularly and abundant- 

 ly in Berks County, and thru the larger part of the Allegha- 

 nian life zone in the eastern half of the state, it is a 

 regular and common ti£BBBE£ bird, while in Pike, Monroe, and 

 Wayne Counties the birds, tho breeding yearly, are local. 

 Mr Dickey reports that it does not nest in Washington and 

 Green Counties except very rarely, while Mr. R. B. Simpson 

 finds them almost unknown in Elk, Forest, and Warren Counties, 

 Thruout Franklin, Center, Hundington, Venango, and Clarion 

 Counties, I have observed it but very locally. 



423. Chaetura pelagica ( Linn «)> Chimney Swift 



The Chimney Swift is 6he of the most widely known 

 and abundant of our nesting birds. From April twentieth to 

 early October we may see their forms silhouetted against 

 the sky or hear their rolling twitter. Here is one species 

 for whieh civilization has little terror, save that its 

 habits, especially in the nesting seasons, have undergone 

 a radical change. It breeds abundantly in every county, 

 even in the heart of our largest cities. 



