73 

 rarely in the northern tier of counties and the Canadian 

 fauna. Mr. Simpson writes me that several years ago a few 

 pairs nested annually at Warren in the shades of the arc 

 lamps but that none have been seen sinoe. In Center County, 

 it is a rare breeder, two small colonies existing to my 

 knowledge. Farther south, however, in Franklin, Adams, 

 Fulton, and Somerset Counties, it is quite common, while in 

 southwestern Pennsylvania especially about Waynesburg, it ts 

 locally abundant* In the southeastern section, it is very 

 local, but a number of colonies exist in Delaware, Montgon- 

 ery, Bucks, Lancaster, and Chester Counties, the largest 

 perhaps being at West Chester, while in Philadelphia County 

 there are small colonies at Holmesburg and Bustleton. In 

 the eastern section, it breeds as far north as Easton. 



612. Petrochelidon lunifrons lunifrons (Say.). Cliff Swallow. 



In the southern counties, the Cliff Swallow is a 

 rather rare and always extermely local breeder, apparently 

 decreasing in numbers. Very often a colony will appear at 

 a locality one season and disappear the next. Mr. Dickey 

 tells me that in 1902 it was abundant at Waynesburg but that 

 since that time, none have been noted. In southeastern 

 Pennsylvania, it was formerly much more common, and thruout 

 a large part of Chester, Delaware, Philadelphia, and Mont- 

 gomery Counties, does not breed at all, tbo colonies still 



