46 BYTHINELLA. 



Genus BYTHINELLA, Moq.-Tand. 



A. Southern species. 

 1. BYTHINELLA ATTENUATA, Hald. 



Hald., p. 22, t. 1, fig. 13. 



No other locality than the single one cited 

 by Haldeman has occurred. It is very proba- 

 ble that it is only a very elongated variety of 

 B. NicMiniana, Lea. 



2. BYTHINELLA NICKLINIANA, Lea. 



Hald., p. 21, t. 1, fig. 12. 



Inhabits streams connected with the Susque- 

 hanna River in Pennsylvania, also various 

 localities in Maryland and Virginia west of 

 the Blue Ridge Mountains. The areas of dis- 

 tribution of all the species of this genus appear 

 to be very circumscribed. 



[27] 



