IIO The Ornithology of Chester County 



Arrival Sept. 24 (1898) Nov. 30 (1890); 

 ave. 24 yrs. Oct. 9. 



Departure Mar. 14 (1899) May 2 (1904- 

 1914) ; ave. 21 yrs. Apr. 23. 



239. Regulus calundula calundula Ruby-crowned 

 Kinglet. Abundant transient. 



Berwyn : 



Spring arrival Apr. 15 (1917) Apr. 27 

 (1910); ave. 12 yrs. Apr. 21. 



Spring departure May 2 (1904) May iS 

 (1905); ave. 6 yrs. May 9. 



Fall arrival Sept. 21 (1898-1901) Oct. 15 

 (1896); ave. 14 yrs. Oct. 6. 



Fall departure Oct. 12 (1898) Nov. 27 

 (1915) ; ave. 14 yrs. Oct. 26. 



240. Polioptila cterula ceerula Blue-gray Gnat- 

 catcher. Straggler; Formerly a summer resident. 

 Michener considered it frequent in summer and 

 Barnard notes its arrival Apr. 15 to 25. The only 

 recent records are of one observed at Kennett 

 Square, Apr. 19, 1914, by Thomas (Cass., xviii, 

 61), and another at Berwyn, May 19-21, 1914, by 

 the writer. 



241. Hylocichla mustehna Wood Thrush, "Peter 

 and Paul," "song thrush," "wood robin." Common, 

 in some localities, abundant ; summer resident. Nid- 

 ification begins about May 16; average date for 

 complete set, May 27. 



Berwyn : 



Arrival Apr. n (1890) May 9 (1885); ave. 

 33 yrs. May I. 



Common Apr. 30 (1890) May 18 (1898); 



