1908.] 



NATURAL SCIENCES OF PHILADELPHIA. 



133 



Selecting three localities within the ten-mile circle, at each of which 

 the Club has had several accurate observers for the past seven years, 

 we have the following dates of first arrival. I = Moorestown, N. J.; 

 II = Media and Swarthmore, Pa. ; III = Haverford and Ardmore, Pa. 



Chaetura pelagica (Chimney Swift). 

 I. 



1901 April 27 



1902 



1903 



1904 



1905 



1906 



1907 



21 

 19 

 24 

 21 

 14 

 23 



Average ". April 21 



Tozostoma rufum (Brown Thrasher). 



1901 April 22 



1902 " 22 



1903 " 5 



1904 '' 17 



1905 " 22 



1906 " 21 



1907 " 28 



April 21 



April 24 

 " 12 

 " 15 

 " 14 



" 26 



Average April 19 



Piranga erythromelas (Scarlet Tanager). 



1901 May 5 



1902 " 2 



1903 " 18 



1904 " 6 



1905 " 5 



1906 " 10 



1907 " 12 



Average May 8 



Sayomis phoebe (Phoebe). 



1901 



1902 Mar. 30 



1903 " 17 



1904 April 3 



1905 Mar. 26 



1906 April 8 



1907 Mar. 17 



April 21 



May 12 

 " 1 



April 18 



May 



May 7 



Average ^lar. 27 



Mar. 15 



Mar. 20 



