Concord, Mass.
1912.
April 1 to
July 1.

  Vireo flavifrons. - Our bird at the Farm arrived May 17 [May 17, 1912] & sang there
in the big elms as usual up to June 5 [June 5, 1912] although those trees were heavily
sprayed on the 3rd [June 3, 1912]. After the 5th [June 5, 1912], however, the Vireo appeared there
only occasionally. There was certainly no brood reared there this year.
In all I noted not more than 3 or 4 V. flavifrons [Vireo flavifrons] this season.
  Ampelis cedrorum. A few Cedar birds must still breed in Concord
as I saw or heard them occasionally through June at the Farm
& along the river.
  Progne subis. Heard twice near Ball's Hill - on May 5 [May 5, 1912] & June 1 [June 1, 1912]. I learn
that there has been a fair-sized colony in the boxes on the
Hoar place & that Mr. Parker has established a new colony of 3 or 4
pairs on his place on Nashawtuck Hill [Nashawtuc Hill]. 
  Hirundo horreorum. Heavy flight of migrants feeding over river at Ball's Hill
April 23 [April 23, 1912] & 29 [April 29, 1912]. Only a few remained to breed. We had the usual pair
in our bungalow barn. Brood of young on branch over river June 30 [June 30, 1912].
  Tachycineta bicolor. Three breeding pairs at Farm, one in Bensen's Pasture,
one in meadow E. [east] of Ball's Hill. Heavy old-time flight of migrants haunting river
April 23 [April 23, 1912] & 29 [April 29, 1912] & very many on 19 [April 19, 1912], 25 [April 25, 1912], 28 [April 28, 1912], 30 [April 30, 1912].