152 PROCEEDINGS OF THE ACADEMY OF [April, 



Chat, Chestnut-sided Warbler. In three of the four years Blue- 

 winged Warbler, Black-throated GreeA Warbler, Black-throated 

 Blue Warbler, Magnolia Warbler, Black-poll Warbler, Kingbird. 



Wave XI. 



1904. 1905. 1906. 1907. 



Maij 10-11. May 12. May 12-13. May 19. 



Bulk Movement in all four years — Yellow-billed Cuckoo, Hummingbird, 



Wood Pewee, Magnolia Warbler, Blackburnian Warbler, Black-poll 



Warbler and Canada Warbler. 



Six Years Records at Philadelphia. 



The following tables present a summary of the arrival dates of the 

 ninety species which are printed upon the schedules of the Delaware 

 Valley Ornithological Club for the years 1902 to 1907, based upon the 

 records of from twenty-five to thirty-five observers for each year, all 

 located within ten miles of the center of Philadelphia. 



Under "first arrival" is given the average date of the first observa- 

 tion reported by any of the observers, and also the earliest and latest 

 first arrival for the six years under consideration. Under ''bulk 

 arrival" is given the date for each year when the species had been 

 reported at half the stations, computed as explained on page 137, and 

 also the average of these six dates. In some cases the data were too 

 meager to warrant this computation, in which instances the 'dates are 

 omitted and only first arrivals given. In a few species, marked by an 

 asterisk, dates which obviously referred to winter residents have been 

 rejected, while in the case of the Long-billed Marsh Wren, Pine 

 Warbler and perhaps a few others the data are probably not sufficient 

 to give accurate results, the species being rare or local. 



