IO2 The Ornithology of Chester County 



Arrival Apr. 23 (1910) May 9 (1894) I ave. 

 2O yrs. Apr. 30. 



Common Apr. 29 (1914) May 21 (1899); 

 ave. 13 yrs. May 12. 



Bulk depart Sept. 4 (1894) Sept. 25 (1895) ; 

 ave. 6 yrs. Sept. 16. 



Last seen Sept. 19 (1893) Oct. u (1897); 

 ave. 14 yrs. Oct. 2. 



217. Icteria virens virens Yellow-breasted Chat, 

 "chat," "oriole." Tolerable common summer resi- 

 dent; inclined to nest in small colonies. Nidifica- 

 tion commences by May 20; average date for com- 

 plete set, May 30. 



Berwyn : 



Arrival May 2 (1904) May 19 (1917) ; ave. 

 12 yrs. May 9. 



Common May 12 (1905) May 26 (1914); 

 ave. 9 yrs. May 16. 



Bulk depart Aug. 8 (1900) Sept. 4 (1894); 

 ave. 2 yrs. Aug. 21. 



Last seen Aug. 21 (1896) Sept. 4 (1894); 

 ave. 3 yrs. Aug. 27. 



218. Wilsonia citrina Hooded Warbler. Not 

 common transient. A female taken at Berwyn, May 

 II, 1898 (No. 644, coll. F. L. B.). 



The only autumnal record I have is that of an 

 adult male found dead in a yard in West Chester 

 Sept. 28, 1915, by R. P. Sharpies, and now in the 

 possession of Miss Sara DeHaven. 



Spring arrival May i (1909) May 4 (1912) ; 

 ave. 4 records May 3. 



Spring departure May n (1899-1909-1910) 



