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 824. Vireosylva olivacea ( Linn . ) . Red-eyed Vireo. 



This is the most common and generally distributed 

 of the Vireos, nesting abundantly thruout the state and 

 being one of the most characteristic of our woodland birds. 



627. Vireosylva gilva gilva ( Vieill .). Warbling Vireo. 



This small vireo is rather irregularly distributed 

 over the greater portions of the state, being apparently 

 more common along the river valleys. In southeastern Penn- 

 sylvania, it is a scarce bird over a large portion of the 

 country, but locally it may be fairly common. In southwest- 

 ern Pennsylvania, it is a common breeding bird, nesting nofcth 

 to the New York line along the Alleghany River in large 

 numbers. In Center County, the Warbling Vireo is a rather 

 scarce nester, and is quite rare in the northeastern conn- 

 ties. Along the Susquehanna River Valley, it is common as 

 far north as Bradford County. 



623. Lanivireo flavifron ( Vieill .). Yellow- throated Vireo. 



This handsome Vireo is a scarce but regular 

 breeding bird in the larger part of the state, nesting 

 sparingly in practically every county. I have received 

 reports of its breeding from all my correspondents and 

 fellow-workers, but they all agree with my observations in 

 calling it scarce. 



