REPORT 



ON THE 



BIKDS OF PENNSYLVANIA. 



With Special Reference to the Food-Hahits, based on over Four 

 Thousand Stomach Examinations. 



BY 



B. H. WARREN, M. D., 



ORNITHOLOGIST, PENNSYLVANIA STATE BOARD OK AGRICULTURE. 



SECOND EDITION, REVISED AND AUGMENTED. 

 ILLUSTRATED BY ONE HUNDRED PLATES. 



Published by Authority of the Commonwealth. 



HAEKISBUKG: 



E. K. MEYERS, STATE PRINTER. 

 1890. 



