87 

 Pike, and Monroe, the Blackburnian Warbler is a fairly com- 

 mon bird. 



667. Dendroica virens ( Gmel . ) . Black- throated Green Warbler. 



The Black-throated Green Warbler is a regular and 

 In some counties a relatively abundant breeding bird along 

 the Alleghanies. It is mainly a bird of the Canadian fauna 

 but in some instances summers within the region usually in- 

 cluded in the Alleghanian fauna. In the northern tier of 

 counties, it is rather irregularly distributed, being com- 

 mon in some localities and almost entirely absent from 

 others. In portions of Center, Huntingdon, and Lycoming 

 Counties, these birds are quite common thruout the breeding 

 season as well as in certain localities in the Pocono 

 Plateau. 



671. Dendroica vigorsi vigorsi (Aud . ) . Pine Warbler. 



The Pine Warbler i3 a regular but rather uncommon 

 breeding bird over a large section of the state but apparent- 

 ly is limited to the mountainous counties. It has been 

 found in summer thruout the northern tier from the Pocono 

 Plateau to Erie County and south along the Alleghanies to 

 Center, Huntingdon, and Cambria Counties. 



