SUPPLEMENT TO BIRDS OF ESSEX COUNTY 157 



a Migrant Shrike a short distance outside of the city limits of Newburyport on 

 August 28, 1915, and again in the same region on August 21, 1916. On October 

 7, 1917, Mr. A. B. Fowler saw a bird of this species at Plum Island. 



265 [624] Vireosylva olivacea (Linn.). 

 Red-eyed Vireo. 



Abundant summer resident. May 5 to September 22 (October 4, 6, 14, 26, 

 27, November 4) . 



Eggs: May 25 to July 20. 



The unusually late dates of October 27 and November 4, record birds seen 

 by me at Ipswich in 1907 and 1917 respectively. 



266 [626-] Vireosylva philadelphica Cassin. 

 Philadelphia Vireo. 

 Very rare transient visitor. 



I would repeat what I said in the original Memoir that this bird, which breeds 

 over a wide area to the north, is probably less rare than it appears to be. During 

 the spring migrations if one should follow up all songs that appear to be given by 

 Red-eyed Vireos, he might discover a Philadelphia Vireo. 



On May 23, 1907, 1 had an excellent view of a Philadelphia Vireo in an island 

 in the Topsfield Marshes. The smaller size, the distinctly yellow tinge of the 

 entire under parts, and the whitish line over the eye make the recognition of this 

 bird easy. The scolding note is less harsh than that of the Red-eyed species and 

 the song, although very similar, is not so continuous. 



267 [627] Vireosylva gilva gilva (Vieill.). 

 Warbling Vireo. 

 Common summer resident. May 5 to September 14. 

 Eggs:]n\y 11. 



