9O The Ornithology of Chester County 



near Whiteland station. I flushed five young from 

 nest at Berwyn on June 3, 1896, and have observed 

 fledgings almost every season (Chapman's Warblers 

 of N. A., 42). 



Berwyn : 



Arrival Apr. 17 (1900) May 6 (1893-6); 

 ave. 23 yrs. May I. 



Bulk arrival Apr. 29 (1914) May 13 (1899- 

 1900) ; ave. 16 yrs. May 5. 



Bulk departure Sept. 13 (1916) Sept. 28 

 (1913) ; ave. 2 yrs. Sept. 20. 



Last seen Sept. 18 (1888) Oct. 7 (1895); 

 ave. 6 yrs. Sept. 27. 



185. Protonotaria citra Prothonotary Warbler. 

 Straggler. Michener and Warren give it as an ex- 

 tremely rare summer resident. Dr. Warren has 

 taken two specimens, one in midsummer, the other 

 in May (Bds. Pa., 1890, 274). 



1 86. Helmitheros vermivorus Worm-eating 

 Warbler. Common summer resident, rather abund- 

 ant in the second growth timber of the Octoraro, 

 Brandywine and Chester Valley hills. The first 

 authentic description of the nest and eggs was pub- 

 lished by T. H. Jackson (Am. Nat., 3, 556) from 

 the type set of five taken near West Chester, June 

 6, 1869, and it has been found breeding the past 

 thirty years with increasing frequency by Jackson, 

 Ladd, Burns and others (Cf. Rhoads, B. N. O. C., 

 vii, 55; Jackson, Orn. and Ool., x, 176; xi, 156; 

 Ladd, Ibid., xii, no, and 149; Norris, Ibid., xv, 

 117; Norris, Jr., Nid., i, 165; Burns, Bd. Lore, 

 vii, 137; Chapman's Warblers N. A., 50). Nidifi- 



