CHESNTJT-SIDED WARBLER. 
381 
ern States ; as, on the 22d of May (1830), a pair appear- 
ed to have fixed on their summer abode, near the 
summit of the Blue Hills of Milton. The note of the 
male was very similar to that of the Summer Yellow Bird, 
being only a little louder, and less whistling ; it resem- 
bles 7 tsh ’tsh 7 tsh 7 tshyia , given at about an interval of 
half a minute, and answered by his mate at some dis- 
tance, near which, it is probable, there was a nest. He 
appeared to be no way suspicious of our approach ; his 
restlessness was subdued, and he quietly sat near the 
same low bushes, amusing himself and his consort for an 
hour at a time, with the display of his lively and simple 
ditty. On their first arrival, previous to pairing, they 
are like the rest of the genus, generally restless, and in- 
tently engaged in the chase of insects amidst the blos- 
soms and tender leaves ; they likewise pursue common 
and green bottle flies with avidity and success. On the 
27th of June (1831) X observed a pair selecting food 
for their young, with their usual address and activity, by 
the margin of a bushy and secluded swamp on the west 
side of Fresh Pond, in this vicinity ; but I had not the 
good fortune to discover the nest. I have, however, 
since, I believe, discovered the nest of this bird, in a 
hazel copse in a wood in Acton, in this state. It is fixed 
in the forked twigs of a hazel about breast high. The 
fabric is rather light and airy, being made externally of 
a few coarse blades and stalks of dead grass, then filled 
in with finer blades of the same, the whole matted and 
tied with caterpillars 7 silk, and lined with very slender 
strips of brown bark and similar white pine leaves. It 
appeared to have been forsaken before its completion, 
and the eggs I have never seen. 
Length from 5 to 5J inches, alar extent about 8. The front, line 
over the eye, and ear-feathers white ; crown brilliant lemon yellow ) 
