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 ('94) 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 ('93), however, 



