CHESTNUT-SIDED WARBLER 157 



period of nine years. In 1901 but one vis- 

 itant was recorded, a male on May 22. In 

 1907 probably fifteen birds came succes- 

 sively. There were ten present together 

 from May 19 to 22, eight males and two 

 females. Most of the records are of a single 

 bird or of two or three birds. The earliest 

 arrival was on May 9, 1902, three birds. 

 First appearances have varied between 

 this date and May 22. The middle of the 

 month, May 12 to 1 6, is the more usual 

 time of arrival. On either May 22, 23, or 

 24 the last bird usually departs. In 1907, 

 when ten birds were present on May 22, 

 but one remained on May 24, and this 

 bird was not noted on the following day. 

 In 1908 a male and a female were present 

 on May 27, but were not noted later. It is 

 not unusual to hear one of its forms of song. 



80. CHESTNUT-SIDED WARBLER 



Dendroica pensylvanica 



The Chestnut-sided Warbler has been 

 absent from the list of the season but once, 

 in 1904. Usually there is a fair representa- 



