62 The Ornithology of Chester County 



four eggs heavily incubated. Berwyn data on mi- 

 gration. 



Arrives — Apr. 15 (1912) — May 6 (1905-1910); 

 ave. 12 yrs., May i. 



Departs — Oct. q (1899) — Nov. 12 (1901- 

 1902) ; ave. 9 yrs., Oct. 25. 



105. Centurus carolinus Red-bellied Woodpecker. 

 Rather rare winter visitant, mentioned by all our 

 list-makers. Phillips found it at Kennett Square, 

 Oct., 1871 (F. and S., vi, 148) ; two specimens 

 were taken by Rhoads at Kimbleville, Jan. i, 1880 

 and Dec. 8, 1881 (Stone, Bds. E. Pa. and N. J., 

 96) ; and Warren has taken three in ten winters 

 (Bds. Pa., 1890, 174). 



106. Colaptes aurattis luteus Northern Flicker, 

 "flicker," "golden-wing," yellowhammer," "yellow- 

 shaft flicker." Common summer resident, occasional 

 resident; the most abundant representative of its 

 family. Nidification begins Apr. 15-25, average 

 date for complete set May 26 (Burns, Mon. of the 

 Flicker, Wils. Bull., No. 31). Migration at Ber- 

 wyn: 



Arrival— Feb. 2 (1888)— Apr. 6 (1899); ave. 

 27 yrs., Mar. 15. 



Common — Feb. 17 (1888) — Apr. 23 (1899); 

 ave. 24 yrs., Mar. 23. 



Bulk — Sept. 13 (1899) — Oct. 19 (1893-1894) ; 

 ave. 12 yrs., Oct. i. 



Last — Oct. 7 (191 5) — Dec. 11 (1900); ave. 20 

 yrs., Oct. 29. 



107. Antrostomus vociferus vociferus Whip-poor- 

 will, "whipper-will," "whipper-ca-loo." Not com- 



