36 

 Greene County but that he was so fortunate as to find one 

 nest. This he took on May 24 , 1905, at which date it held 

 four eggs and one of the Cowbird. 



659. Dendroica pensylvanica ( Linn . ) . Chestnut-sided Warbler, 



The Chestnut-sided Warbler is an abundant breed- 

 ing bird in practically all the counties of Pennsylvania 

 lying within the Alleghanian and Canadian faunas. Mr. Stone 

 has found it breeding as far south as Welsh Mountain, 

 Lancaster County, while in Berks County it is a regular 

 breeder. Mr. Doan has found it nesting very rarely in 

 Bucks County, while some fourteen years ago Mr. S. B. Ladd 

 took a set of four eggs in the Carolinian fauna of Chester 

 County near Prazier. Along the Alleghanies especially 

 from Center County northward, it is an abundant species. 



662. Dendroica fusca ( Mull . ) . Blackburnian Warbler. 



This beautiful warbler is a regular breeder along 

 the Alleghany Mountains from the northern tier south into 

 Maryland. In Pulton and Bedford Counties, it is common 

 only in those counties having a well pronounced Canadian 

 fauna. In the western counties, Mr. Simpson tells me it is 

 one of the rarer breeders, but in some of the northern 

 counties especially Clinton, Lycoming, Potter, Sullivan, 



