BREWSTERS WARBLER. 
THREE years ago, in the Auk for October, 1907, I published an account of 
a male Brewster’s Warbler found during the month of June on the edge of a 
swamp in the town of Lexington, Mass. Although the bird remained in the 
same locality throughout the breeding season, neither his mate nor nest was 
discovered and little hope was entertained that this interesting addition to the 
Lexingtonian fauna would become firmly established. That such is the case, 
however, the observations recorded in these pages will tend to show. While I 
was walking through this same swamp with Dr. W. M. Tyler on the fifth of 
June of this year (1910), my companion detected a Brewster’s Warbler, appar- 
ently a female, in some shrubbery in one corner of the swamp, within one hun- 
dred and seventy yards of the station oecupied by the bird which I discovered 
in 1907. Close at hand, on the other side of a fence that divides the swamp 
from a jungle of Gray Birches and Raspberry vines, a male Brewster’s Warbler 
and a male Golden-winged Warbler were chasing each other about amid the 
low trees and shrubs. Both were singing, one in quick response to the other. 
The song of each was the familiar song of the Golden-wing, although a difference 
between the voices of the two birds was discernible, the quality of the tone being 
sharper and clearer in the Brewster’s than in the Golden-wing. The difference 
however was no greater nor of any other sort than what one perceives in com- 
paring the songs of different individuals of the Golden-wing. In the mutual 
chase of the two males, the Golden-wing seemed to be the more aggressive. 
On returning to the spot where we had left the female, we flushed her from 
her nest which rested firmly on the ground at the foot of some stalks of Meadow 
Rue and Rugose Goldenrod, and contained five eggs — white speckled with black 
or dark brown around the larger pole, and indistinguishable from the eggs of the 
Golden-wing. The nest, too, was fashioned like the Golden-wing’s, being built 
of dry leaves and Grapevine bark, lined with fibrous shreds of plants and with 
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