Ortmann : Unionid/E of Western Pennsylvania. 191 



This species is recorded in Harm's list from western Pennsylvania, 

 in Clapp's list from Alleghen}^ County, and it occurs in the Ohio 

 River according to Rhoads. 



It is found in the larger rivers and is generally rather abundant. In 

 the Allegheny it goes up as far as Warren County, where it also enters 

 the Connewango Creek. It is in French Creek in Venango and Craw- 

 ford Counties. In the Monongahela River it goes up to Dunkard Creek 

 and the Cheat River. Its former presence in the Conemaugh River 

 at New Florence, Westmoreland County, has also been ascertained by 

 the writer. None of the smaller creeks contain this species, and it is 

 absent in the whole Beaver drainage. 



10. Lampsilis iris (Lea). 



Recorded in Harn's list from western Pennsylvania. Simpson gives 

 L.fatua for the Beaver River. The specimen (from Wampum), upon 

 which this record is based, is in the Carnegie Museum, and undoubt- 

 edly is L. iris. The writer found additional material of this form in 

 the Beaver drainage, not far from Wampum. 



It is a rather rare species in our region, nowhere abundant, but scat- 

 tered over a large area. It is most frequent in Little Beaver Creek, 

 Beaver County, in the Mahoning and Shenango Rivers, in the Neshan- 

 nock and Pymatuning Creeks in Lawrence and Mercer Counties. It 

 is found also in Crooked Creek, Armstrong County, in French Creek, 

 Crawford County, and in Dunkard Creek, Greene County, and the 

 Cheat River, Fayette County. 



11. Lampsilis (Carunculina) parva (Barnes). 



Reported from western Pennsylvania by Harn. Rhoads' U. parvus 

 probably is Micromya fabalis . 



The writer has found a single dead, but well preserved shell of this 

 species in Conneaut Outlet, Crawford County. 



12. Proptera alata (Say). 



Given in Harn's list as from western Pennsylvania; recorded by 

 Stupakoff from Allegheny County, and by Rhoads from the Ohio River. 



Abundant in the Ohio and formerly in the Monongahela. Goes up 

 in the latter to Dunkard Creek, Greene County, but not into the 

 Cheat. In the Allegheny River it is found in Allegheny and Arm- 

 strong Counties, but not very frequently, and does not go farther up. 

 In addition it has been collected in the Little Beaver Creek at Cannel- 

 ton, Beaver County (Miss Vera White), but not farther up. It is 

 absent in the whole Beaver drainage. 



