. The ornithology of Chester County, Pennsylvania . on reports it probably nesting alongBuck run in East Fallowfield Twp., but I believethat these birds are all from the Lancaster countycolonies. There is a large herony in the easternpart of the Chester valley, in Tredyffrin Twp.(Burns, Bird-Lore, xix, 197). Nidification beginssoon after arrival, average date for complete set,May lo. Thomas notes its arrival at KennettSquare, Apr. 12 (1908)—Apr. 22 (1915), and itdoubtless averages several days earlier at its breed-ing grounds than I am able to offer for Berwynvicinity: Arrival—Apr. 15 (1917)—A
. The ornithology of Chester County, Pennsylvania . on reports it probably nesting alongBuck run in East Fallowfield Twp., but I believethat these birds are all from the Lancaster countycolonies. There is a large herony in the easternpart of the Chester valley, in Tredyffrin Twp.(Burns, Bird-Lore, xix, 197). Nidification beginssoon after arrival, average date for complete set,May lo. Thomas notes its arrival at KennettSquare, Apr. 12 (1908)—Apr. 22 (1915), and itdoubtless averages several days earlier at its breed-ing grounds than I am able to offer for Berwynvicinity: Arrival—Apr. 15 (1917)—Apr. 30 (1906); ave,7 yrs. Apr. 20. Departure—Oct. 6 (1911)—Nov. 6 (1893);ave. 3 yrs. Oct. 23. 43. Nycticorax violacens Yellow-crowned NightHeron. Rare summer resident. On May 14, 1915,I found it present and evidently nesting in thelocal colony of An individual, prob-ably not always the same one; was observed circlingjust above the tree tops on three occasions, and I hada view of it through the glass while it perched close. Photo hy A. C. Redfield BLACK-CROWNED NIGHT HERON NEST AND EGGS
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, bookyear1919
