37 



The following explanations will serve to make clear the nature of 

 the notes accompanying each species: 



Immediately beneath the name is given the breeding range and 

 winter distribution of the species, which will show the relation which 

 its occurrence in our district bears to its line of migration and its 

 winter and summer home. The statements are taken from Ridg- 

 way's Manual, and other sources, but in many cases, owing to lack 

 of exact data, they are necessarily only approximate; the detail 

 of distribution west of the Alleghanies, moreover, has not been 

 attempted. 



The first general statement is intended to describe the character 

 of the occurrence of the species in the district under consideration 

 or in a certain part of it. If the species occurs elsewhere in Penn- 

 sylvania or New Jersey under different circumstances (^. e., if it 

 is a transient in the lowlands but breeds in the mountains) an addi- 

 tional statement to that effect is added. 



The dates of the arrival and departure of migrants are based upon 

 the records of the Delaw^are Valley Ornithological Club, from the 

 vicinity of Philadelphia, as far as inland species are concerned, while 

 for coast birds they generally refer to the time of occurrence at 

 Atlantic City, N. J. 



In the case of rare species a more detailed account is often given, 

 including a list of specimens which have been taken in eastern 

 Pennsylvania or New Jersey, with data. 



It has been thought better to include those species which have be- 

 come extinct or which are only accidental stragglers in our district 

 in their regular systematic place in the list for convenience of refer- 

 ence, but all such species have their numbers enclosed in brackets, 

 so that they may be readily distinguished. 



All important statements are followed by the name of the person 

 upon whose authority they are quoted, and in the case of published 

 matter a brief reference to the place of publication is added. In the 

 case of TurnbuU's '■'^ Birds of East Pennsylvania and New Jersey" 

 and Warren's ^^ Report on the Birds of Pennslyvania" special refer- 

 ence has often been omitted, so wherever these authors' names occur 

 the statements for which they are quoted will be understood to be 

 taken from the above works. 



At the end of the Bibliography will be found a list of authors not 

 only of published matter, but also of the manuscript notes, etc., which 

 have been used in the preparation of the following pages. 



