199 ANNALS OF THE CARNEGIE MUSEUM. 
39. Quadrula lachrymosa (Lea). 
Never reported before. A single living individual was found by the 
writer in the Ohio River at Cook’s Ferry, Beaver County. 
40. Quadrula pustulosa (Lea). 
Cited in Harn’s list from western Pennsylvania. Rhoads records it 
from the Ohio and Beaver. 
It occurs in the larger rivers, but is now rather scarce. It goes up 
in the Monongahela as far as the Cheat River in Fayette County, in 
the Allegheny to southern Armstrong County, and in the Beaver to the 
Mahoning River in Lawrence County. 
41. Quadrula cooperiana (Lea). 
Reported by Rhoads from the Ohio in Allegheny and Beaver 
Counties. 
The writer has found only one living and two dead shells of this 
species in the Ohio in Beaver County. 
42. Quadrula rubiginosa (Lea). ; 
Not mentioned in Harn’s list ; reported by Clapp from Allegheny 
County, and by Rhoads from the Ohio River in Allegheny County. 
Typical specimens of this species are found in the smaller creeks of 
the southwestern section of the state. It occurs in Raccoon Creek, 
Beaver County, and was formerly found in Chartiers Creek, Allegheny 
County. It exists in the Monongahela drainage, Ten Mile Creek, 
Washington and Greene Counties, Dunkard Creek, Greene County, 
and also in the Allegheny River in Armstrong County, and in Crooked 
Creek, Armstrong and Indiana Counties. Specimens from the larger 
rivers (Monongahela and Ohio) are not typical, and approach more 
or less Q. “rigona (Lea). Nevertheless no typical ¢7gona has ever 
been found, the specimens reported by Stupakoff as ¢7zgona being 
probably, and those reported by Rhoads surely this intermediate form. 
43. Quadrula obliqua (Lamarck). 
Call and Harn record od/iguus and mytiloides from western Pennsyl- 
vania, Stupakoff gives (1. fyramidatus from Allegheny County, Clapp 
U. obliqguus from Allegheny County, and Rhoads has U. odd:guus from 
the Ohio. Of Rhoads’ specimens only a few belong here. 
This form is quite frequent in the Ohio River in Beaver County, 
and it used to be abundant in the Ohio in Allegheny County, and in 
the Monongahela at Charleroi, Washington County (Ehrmann Collec- 
tion). It is present in the Allegheny in Armstrong County, and a 
single specimen was found in the Beaver at Wampum, Lawrence 
County (Clapp & Smith Collection). 
