Vol. XXVI, pp. 21-26 February 8, 1913 



PROCEEDINGS 



OK Till, 



BIOLOGICAL SOCIETY OF WASHINGTON 



BIRD MIGRATION IN THE DISTRICT OF COLUMBIA 



BY WELLS W. COOKE, 

 Bureau of Biological Survey. 



Five years ago an article was published in these Proceedings 

 under the above title, giving a summary of the data at that 

 time available on the movements of the birds in the District of 

 Columbia. The last tiv<' years have been marked by great 

 activity in bird study. During each of these years notes on 

 migration have been contributed by more than twenty-live 

 persons, connected for the most part with the Biological Survey 

 or with the very flourishing local Audubon Society. The fol- 

 lowing table is based on these notes in addition to those already 

 published, making a total of more than thirty-five years of 

 observations. The first part of the table contains 98 species, 

 which occur regularly in the District each year, arranged 

 chronologically in the order of their arrival; to these is added 

 a list of 9 species, visitors from the north, which are more or 

 less common in the District during the winter, arranged in the 

 order of their departure. This is followed by a list of 41 species 

 that occur in the District throughout the whole year. The 

 three lists comprise a total of 148 species which constitute the 

 regular bird population of the District, and most of which are 

 common enough to be expected in the yearly list of any good 

 observer. 



The District of Columbia in an ornithological sense includes 

 the country within a radius of ten miles of the Capitol, but this 

 limit has been exceeded to include notes taken at the Great 

 Falls of the Potomac. No addition has been made to the bird 

 list of this area during the past five years and the total still 

 G— Pkoc. Biol. Soc. Wash.. Vol. XXVI, 1913. (21) 



