Hirundo horreorum
Middlesex Co., Mass. [Middlesex County, Massachusetts]
1875. April 30 -1875
April 30. [April 30, 1875] Clear and very windy with slight shower
in P.M. Took the 8.10 A.M. train for
Concord and met Al. Garland on the cars:
he was going to try the snipe at Bedford.
Arriving at C. [Concord] started off [?] from the 
town and spent the whole day in the
wood taking the 6.36 train home at
Lincoln. Devoted most of the time
to hunting for hawks nests but did
not succeed in finding any, though
near Lincoln I discovered a pair
of the birds (B. borealis [Buteo borealis]) and shall
try for their nest next week. Shot a
Reg. calendula [Regulus calendula] [male], D. palmarum [Dendroica palmarum] 6 (2 [female])
D. pina [male], & D. coronata [Dendroica coronata] 2 [male]. Shot these
latter from a flock of several hundred
which were collected in the woods along
the shore of Walden p. [Walden pond]. The attraction
here I soon discovered in immense
swarms of [delete]a dipterus[/delete] insects, a species
of Diptera which occurs near ponds in
myriads at this season. Only a few
D. coronata [Dendroica coronata] were with the red polls. Out
near the centre of the pond itself was
a single Hirundo horreorum skimming
about close to the surface of the water.
Found signs of Scops Asio in nearly
every old orchard that I visited but
was unable to discover a nest though 
some of the droppings, etc were quite 
fresh: in many holes I found feathers
etc. of small birds principally robins.
Found two crows nests from which I
started the birds, but did not take the
trouble to examine them. Ascended a