Concord, Mass.
1912.
April 1 to
July 1

  Dendroica aestiva. - For the first time in years no Yellow Warbler
nested in the garden at the Farm. I heard a [male] singing in Lawrence's 
garden on June 3 [June 3, 1912] and one where the road crosses Bigelow Brook
near Peterson's on the 26th [June 26, 1912]. The species was breeding rather
more numerously than usual along the river, however. Two [males]
sang in the fringe of trees opposite Pad Island, one across the
river from Bensen's Knoll, several between Hunt's Pond &
Flint's Bridge.
  Dendroica pennsylvanica. - Chestnut sided Warblers have been
diminishing hereabouts in numbers for several years. In the
Ball's Hill region a [male] singing in the swamp behind the hill
is the only one I know of that has remained through June.
At the Farm two [males] have sung in the Berry Pasture & a third
on the hillside east of our barn. These four (in all) are
the only ones that have been under my observation
during the breeding season.