342 - TRANSACTIONS OF THE [1895 
are able to go with them, the latest date being August 27 (’94), 
when only one pair was left. On July 28 (’95), 6 were 
in a small dead tree in Dulaney’s Valley; as there were only 
one adult male, this family presumably had started to migrate. 
In this same tree on August 12 (’94), at 10.40 A. M.,I saw 18 
(3 adult males) all sound asleep, with their heads under their 
wings. On being flushed by a knock on the tree they flew 
round for a few minutes and returning, settled themselves again, 
evidently played out from a long migration flight At Bay 
Ridge, towards dusk, on August 18 (’95), quite a large number 
flew south in an uneven but regular column. 
On May 18 (’92) a box held 8 nests in various stages of 
construction, from just started to ready for eggs, and on May 
29 (794) another had 21, ranging from just started to having 
the complete set of 5 eggs, while as late as July 9 (95, Hen- 
ninghouse) 3 fresh eggs were taken. Sets are 3 of 5. Usually 
nesting in the boxes put up for them, on June 12, ’94, I found 
nests with young under the eaves of cottages at, Ocean City. 
At Washington they formerly nested in the tops of the columns 
. of the Treasury Building, now “in crevices of the Post Office 
Department Building and the Masonic Temple” (Richmond). 
At Bay Ridge, on June 28, ’93, several pairs were nesting 
in the hoods of electric lamps (Gray). At Cumberland on 
June 4, 95, I found them in the electric lamps, and also in 
cornices of buildings. 
Petrochelidon lunifrons (612). Cliff Swallow. 
Summer resident, extremely local and not common; but a 
colony may locate their nests under the eaves anywhere, occupy 
them any number of summers, then, without apparent cause, 
leave, sometimes coming back after one or more years. First 
seen on April 16 (93), when 26 were flying in a loose flock; 
the last were also seen in a loose flock on September 3 (’93). 
At Washington, September 12 (A. C., 52). Nesting dates range 
from June 7 (82), five fresh eggs, to July 23 (’93), when 
young birds were still in nests. On July 22 (’98), however, 
