xii Introduction. 



well known in scientific circles, as a l^^pinist, I am greatly indebted 

 for much valuable assistance in the preparation of this report. 



In conclusion, it may be stated that the ornithologist has had no 

 disposition to disregard the law limiting this report to a certain num- 

 ber of pages, but found it impracticable, in consequence of the fact 

 that the avi-fauna of Pennsylvania embraces over three hundred spe- 

 cies and sub-species, to give the required descriptions, etc., without ex- 

 ceeding the limit. While the report exceeds by a few pages the limit 

 given in the act authorizing its publication, I would add that over 

 two hundred and fifty pages of the manuscript originally intended 

 for the publication, have been dropped with a view of keeping 

 within the prescribed limit. Although obliged to eliminate much 

 matter relating to the feathered tribes, I have endeavored to give a 

 brief history of the birds which are most common and generally met 

 with, and in the Appendix have given a list of all birds occurring (so 

 far as can be ascertained from reliable sources) in the Keystone Com- 

 monwealth. 



B. H. Warren. 



West Chester, Pa., Nov. 1, 1888, 



