70 The Ornithology. of Chester County 
(1914); ave. 28 yrs. May 7 
Fall aera 4 figsey See 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 phaniceus phaniceus 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. 18 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,” “‘yellowbreast.” Com- 
mon resident, gregarious and rather local in winter. 
