148 THE CHESTNUT-SIDED WARBLER. 
the breast pulsing with the earnestness of expression. It is not easy to recog- 
nize amid the May medley of song. 
The nest is lashed upon a horizontal branch, or bound into a horizontal 
fork, well out from the tree, and always well up from the ground. ‘Two nests 
which I have found in the famous South Woods were in a beech and rock 
maple tree respectively, one thirty, the other sixty feet from the ground. ‘These 
nests resemble the nest of Redstart more than the nest of any other bird, both 
in composition and construction, but they were stuccoed with cobwebs out- 
wardly. The material was mostly shreds of bark and horse-hair, with a little 
milkweed bark. The birds are very solicitous for their nest and young, utter- 
ing the sharp chip of alarm and distress, and venturing within a few feet of 
the intruder, but they do not show a disposition to fight. I have found nests 
only near small streams in the woods, or depressions where temporary 
streams form after severe rains or in spring. 
The eggs are hardly distinguishable from other warblers’ eggs. The 
markings incline to darker, or to less reddish in the browns. Four is the usual 
number for a complete set. It appears that this warbler builds too high for 
the Cowbird, or else the nest is too small to accommodate the sneaking 
creature. LYNDs JONES. 
No. 66. 
CHESTNUT-SIDED WARBLER. 
A. O. U. No. 659. Dendroica pensylivanica (Linn.). 
Description.—dAdult male: Extreme forehead ashy white; crown bright 
yellow (gamboge) ; hind neck streaked black and ashy white; back and rump 
bright olive-green, with partially concealed black stripes; upper tail-coverts black, 
edged with ashy and olive; wings and tail black, primaries and rectrices edged 
with ashy; secondaries and tertials edged with yellowish green; two irregular 
wing-bars light yellow; three outer pairs of tail-feathers extensively white on 
inner webs; a black patch on the side of the head including eye; an irregular 
white patch behind this; below white; sides of breast and sides with large chest- 
nut patches, irregular or interrupted; bill black; feet dark. Adult female: Like 
male but duller; chestnut of sides much restricted; black face blotch divided by 
ashy, etc. No autumnal change in either sex. Jmmature: Quite different; 
above bright olive-green; below ashy or sordid white; wing-bars and tail-blotches 
as in adult; rectrices in unworn plumage quite acute; bill light below. Length 
4.75-5.25 (120.6-133.3) ; av. of six Columbus speciments: wing 2.36 (59.9) ; tail 
T.On ((4855))5) bill 26N(Onm)E 
Recognition Marks.—Smaller; white under parts and chestnut sides of 
adult; light yellow wing-bars of young. 
