7O The Ornithology of Chester County 



(1914) ; ave. 28 yrs. May 7. 



Fall arrival Aug. 4 (1886) Sept. 25 (1890) ; 

 ave. 8 yrs. Aug. 28. 



127. Molotherus ater ater Cowbird, "cow black- 

 bird," "cowpens bunting," "lazybird," "little black- 

 bird." Tolerably common summer resident. Dr. 

 Warren states that Harry Garrett of Willistown 

 had noted it as an occasional resident, and I once ob- 

 served it at Berwyn on Jan. 17, 1913. This species 

 builds no nest, but lays its eggs in other birds' nests 

 where the young are hatched and reared by the foster 

 parents. 



128. Agelaius phoenlceus phceniceus Red-wing- 

 ed Blackbird, "red-wing," "swamp blackbird," 

 "swampy." Common summer resident, gregarious, 

 and most abundant during migrations. Nesting 

 data: Berwyn, May 25, 1889, four eggs taken by 

 W. E. Rotzell. The Kennett Square, Westtown 

 and West Chester migration data for first arrival 

 average several days earlier than that of Berwyn 

 which I give below: 



First arrival Feb. 17 (1909) Apr. 10 (1886) ; 

 ave. 29 yrs. Mar. 15. 



Bulk arrival Mar. 4 (1908) Apr. 24 (1902) ; 

 ave. 1 8 yrs. Mar. 25. 



Bulk departure Sept. 30 (1916) Oct. 25 

 (1911) ; ave. 6 yrs. Oct. 14. 



Last seen Sept. 15 (1902) Nov. 5 (1888); 

 ave. 7 yrs. Oct. 26. 



129. Sturnella magna magna Meadow Lark, 

 "field lark," "meadow lark," "yeliowbreast." Com- 

 mon resident, gregarious and rather local in winter. 



