102 The Ornithology of Chester County 
Arrival—Apr. 23 (1910)—May 9 (1894) ; ave. 
20 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. 11 (1897); 
ave. 14 yrs. Oct. 2. 
217. Icteria virens virens Yellow-breasted Chat, 
“chat,” “oriole.” ‘Colerable 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 Vis, Aes eae 
Last seen—Aug. 21 (1896)—Sept. 4 (1894) ; 
AVE! Si Vise Ue. 27. 
218. Wilsonia citrina Hooded Warbler. Not 
common transient. A female taken at Berwyn, May 
11, 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. Sharples, and now in the 
possession of Miss Sara DeHaven. 
Spring arrival—May 1 (1909)—May 4 (1912); 
ave. 4 records May 3. 
Spring departure—May 11 (1899-1909-1910)— 
