Annotated List 99 



209. Dendroica discolor Prairie Warbler. Rare 

 transient, and common summer resident in the south- 

 ern part of the county. Dr. Montgomery has seen 

 it only on two dates, May 10, 1890, when three were 

 seen and a female secured, and on May 2, 1897. 

 Dr. Warren observed it on different occasions dur- 

 ing the summer months on the Barren ridge (Bds. 

 Pa., 1890, 293) ; Pennock and Carter found it quite 

 abundant and probably breeding in the serpentine 

 barrens of the southern border, June 16, 191 1 (Auk, 

 xxix, 245 ) ; and Burn saw a male near Chrome, in 

 the same locality, on July 3, 1916. 



Spring arrival — May 2 (1897) — May 25 



(1907) ; ave. 4 yrs. May 11. 



210. Seiurus aurocapillus Ovenbird, "ground 

 thrush." Abundant summer resident. Nidification 

 begins about May 1 8 ; average date for complete 

 set. May 29. 



Berwyn : 



Arrival— Apr. 13 (1890) — May 12 (1888-9); 

 ave. 28 yrs. Apr. 30. 



Common — Apr. 28 (1910-11) — May 13 (1902); 

 ave. 26 yrs. May 5. 



Bulk departure — Aug. 29 (1896-1902) — Oct. 3 



(1908) ; ave. 8 yrs. Sept. 9. 



Last seen — Sept. 12 (1913) — Oct. 7 (1897); 

 ave. 9 yrs. Sept. 25. 



211. Seiurus noveboracensis noveboracensis Wa- 

 ter-Thrush. Not common. Montgomery took a 

 specimen on May 10, 1890, West Goshen Twp., and 

 I secured another at Berwyn, Sept. 22, 1906 (No. 

 892, coll. F. L. B.). 



