Annotated List 91 



cation begins a few days after arrival and in the 

 fifty or more records in the vicinity of Berwyn, the 

 average date for a complete set is May 28. 



Berwyn : 



Arrival Apr. 30 (1916) May 14 (1896) ; ave. 

 1 8 yrs. May 7. 



Common May 5 (1905) May 19 (1901); 

 ave. 13 yrs. May 12. 



Departure Aug. 29 (1896-1902) Sept. 2 

 (1898) ; ave. 5 yrs. Sept. I. 



187. Vermivora pinus Blue-winged Warbler. 

 Common summer resident, apparently most abund- 

 ant in the eastern part of the county, especially about 

 Birmingham (Norris, Jr., Orn. and Ool, xiv, 138) 

 and Berwyn (Burns, Wils. Bull., 35, 39). Also 

 found breeding at Kennett Square, by Phillips (F. 

 and S., vi, 215); West Chester, by Rhoads, 

 (Coues, B. N. O. C., iii, 194) ; Willistown, by 

 Hall (Orn. and Ool., 9, 137). Nidification com- 

 mences soon after arrival; average date for com- 

 plete set May 29 (Burns in Chapman's Warblers 

 N.A.,67). 



Berwyn : 



Arrival May 3 (1900-1905) May 15 (1896) ; 

 ave. 21 yrs. May 6. 



Common May 3 (1900) May 17 (1917); 

 ave. 12 yrs. May 8. 



Departs Aug. 13 (1890) Sept. 6 (1897); 

 ave. 4 yrs. Aug. 24. 



1 88. Vermivora chrysoptera Golden-winged 

 Warbler. Rare transient. I have no fall dates and 

 include all spring records available: May 4 (1902) 



