94 The Ornithology of Chester County 



lo yrs. May 6. 



Common — May 7, 1905. 



Last seen — Sept. 19, 1893; Sept. 20, 1894. 



195. Dendroica ccerulescens carulescens Black- 

 throated Blue Warbler. Common, sometimes abun- 

 dant, transient. 



Spring arrival — May i (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 (19 13); 

 ave. 2 yrs. Sept. 18. 



Last seen — Sept. 16 (1905) — Nov. 4 (1917); 

 ave. i6 yrs. Sept. 27. 



196. Dendroica coronata Myrtle Warbler, "yel- 

 low-rump." Common transient, occasional wrinter 

 visitant. 



Berwryn : 



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 (i888) — Sept. 30 (1911); 

 ave. 4 yrs. Sept. 21. 



Last seen — Oct. 8 (1908) — Oct. 27 (1893) ; ave. 

 7 yrs. Oct. 18. 



