SUPPLEMENT TO BIRDS OF ESSEX COUNTY 165 



289 [667] Dendroica virens (Gniel.). 



Black-throated Green Warbler. 



Very common summer resident. April 22 to October 27 ; average date of 

 arrival for eight years, May 4. 



Eggs: May 30 to June 17. 



290 [671] Dendroica vigorsi (Aud.). 



Pine Warbler. 

 Common summer resident. March 29 to October 31. 

 Eggs: May 15 to June 16. 



291 [672] Dendroica palmarum palmarum (Gmel.). 



Palm Warbler; Red-poll Warbler. 



Rare autumn transient visitor. September 3 to October 12. 



^Ir. Ralph Hoffmann saw one in Ipswich on October 8, 1919; Dr. W. M. 

 Tyler picked one up dead on the Newburyport turnpike near Ipswich a few 

 days later. 



292 [672a] Dendroica palmarum hypochrysea Ridgw. 



Yellow Palm Warbler; Yellow Red-poll. 



Abundant transient visitor. April 5 to May 16 (May 21); October i to 

 October 26 (November 2, 4) ; average date of arrival in the spring for eight years, 

 April 19. 



The November 2 record is of a bird seen at Plum Island, in 1918, by Judge 

 C. F. Jenney and the November 4 record is of a bird seen in Danvers, in 1917, by 

 Dr. W. G. Fanning. 



293 [673] Dendroica discolor (Vieill.). 



Prairie Warbler. 



Common summer resident, locally. May 5 to September 25. 



Eggs: May 29 to June 12. 



Swampscott has been so built up and its bushy lands destroyed that it is 

 doubtful if the Prairie Warbler still breeds there to any extent. It does breed in 

 the pastures about Salem, but I know of no other breeding locality in the County. 



