134 APPENDIX. 



cealed in any way. When found the nest was empty, but on 

 May 23 it contained five egg and one of the Cowbird. A few 

 days later the nest contained two eggs of the warbler and the 

 Cowbird 's. These were cold and the nest was probably aban- 

 doned. 



Besides the two methods of singing given on page 12 the 

 Black and White Warbler utters a more musical lay, and at 

 times gives quite a sweet song, through which, however, it of- 

 ten mingles some of the sharper, lisping notes. Occaisonally 

 this peculiar song is given in autumn, but much softened. 



Black-throated Blue Warbler. Southern examples 

 found breeding from the mountains of Pennsylvania south- 

 ward to western North Carolina have been separated sub-spe- 

 cifically from the northern form under the name of Cairns' 

 Warbler, on account of the darker colors above and the pres- 

 ence of more or less black on the back, but I have seen spec- 

 imens from Massachusetts which had the back quite black. 



The song of a Black-throated Blue heard at Newton Up- 

 per Falls, May 18, 1904, consisted of three rather hollow 

 sounding notes like, -tvah ucah zva/i, followed by a trill of 

 about four notes so rapidly given as to sound neaily like a 

 single lisp. 



Miss Alice C. Kendall reports the Black-throated Blue as 

 occurring at Holden, Massachusetts, all summer ; I saw a spe- 

 cimen when with her there August 25, 1904. 



Chestnut-sided Warbler. On page 67 will be found a 

 description of the song and a comparison between it and that 

 of the Yellow Warbler. Quite a common song of the Chest- 

 nut-sided is a rather low, harsh warble, consisting of from four 

 to six notes. These notes are given in about the same tone 

 from beginning to end, but are, perhaps, uttered a little more 

 faintly toward the temirnation of the song. I have heard this 

 song as early as May 1 1 and as late as August 13, but the late 



