Q4 The Ornithology of Chester County 
10 yrs. May 6. 
Common—May 7, 1905. 
Last seen—Sept. 19, 1893; Sept. 20, 1894. 
195. Dendroica ca@rulescens ca@rulescens Black- 
throated Blue Warbler. Common, sometimes abun- 
dant, transient. 
Spring arrival—May 1 (1912)—May 21 
(1899); ave. 18 yrs. May 8. 
Common—May 7 (1909-1914-1916)—May 23 
(1899); ave. 16 yrs. May 12. 
Departure—May 8 (1909)—June 3 (1917); 
ave. 14 yrs. May 18. 
Fall arrival—Sept. 8 (1898)—Sept. 28 (1914) ; 
ave. 7 yrs. Sept. 16. 
Common—Sept. 8 (1898)—Sept. 28 (1913); 
ave. 2. yrs. Sept. 18. 
Last seen—Sept. 16 (1905)—Nov. 4 (1917); 
ave. 16 yrs. Sept. 27. 
196. Dendroica coronata Myrtle Warbler, “yel- 
low-rump.”’ Common transient, occasional winter 
visitant. 
Berwyn: 
Spring arrival—Apr. 7 (1893)—May 2 (1914); 
ave. 8 yrs. Apr. 24. 
Common—May 4 (1888)—May 12 (1906); 
ave. 6 yrs. May 6. 
Departure—Apr. 30 (1916)—May 17 (1917); 
ave. 10 yrs. May 9. 
Fall arrival—Sept. 5 (1888)—Sept. 30 (1911); 
ave. 4 yrs. Sept. 21. 
Last seen—Oct. 8 (1908)—Oct. 27 (1893) ; ave. 
7 yrs. Oct. 18. 
