76 

 Beth Ayres. Farther to the north in Bucks and Northampton 

 Counties, there are a number of banks where these swallows 

 nest in abundance. 



617. Stelgidopteryx serripennis ( Aud . ) . Rough-winged Swallow, 



The Rough-tfinged Swallow is another bird that is 

 gradually pushing its way northward beyond the limits of the 

 Carolinian fauna. There is no doubt but that this species 

 has often been confused with the Bank Swallow, and yet to 

 my mind, there is no reason why it should be. The nest is 

 almost invariably distinct, while the hole is very rarely 

 built by the birds themselves, and as a rule it is a soli- 

 tary species, only occasionly nesting in small colonies. 

 Mr. Stone speaks of not having any authentic instances of 

 its breeding north of the Carolinian fauna in 1394. Since 

 that time, it has increased its range until it covers prac- 

 tically the whole state, tho as yet it is a rare breeder in 

 the Canadian fauna. I have taken nests of this HX1?B species 

 as far north as Stroudsburg, Monroe County, and Warren, 

 Warren County, while in Center County it is a regular and 

 fairly common breeder. I have also seen these birds during 

 the breeding season in Luzerne, Wyoming, and Clarion Coun- 

 ties. In southwestern Pennsylvania, Mr. Dickey calls them 

 scarce. 



