I lO 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 18 

 (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 cierula carula 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. 11 (1890) — May 9 (1885) ; ave. 

 33 yrs. May i. 



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



