38 

 673. Dend^oica discolor ( Vieill . ) . Prairie Warbler. 



In Dr. Warren's Birds of Pennsylvania he speaks 

 of the fact that this species nests sparingly on the Barren 

 Ridge in Chester County. Recently Mr. J. D. Carter has 

 confirmed Dr. Warren's record and found the Prairie Warbler 

 to he a regular summer resident in southern Chester County. 

 This is apparently the only place within the state where it 

 has "been definitely recorded as breeding, tho it undoubtedly 

 nests rarely at other points along the southern line. Mr. 

 Simpson tells me that it has been reported to breed in 

 Crawford County, but as yet the report has not been confirmed 



674. Seiurus aurocapillus ( Linn . ) . Oven-bird. 



The Oven-bird is perhaps the most generally 

 abundant and well distributed Warbler nesting within the 

 state. It is one of the most common and characteristic 

 birds occuring within the state and breeds in numbers in 

 every county. 



675. Seiurus noveboracensis noveboracensis ( Gmel . ) . Water- 

 thrush . 



The northern Water -thrush breeds every season but 

 not in large numbers in a number of the mountainous counties 

 whose fauna is typically well marked Canadian. Formerly a 

 good deal of confusion seems to have existed between the 



