216 MEMOIRS OF THE CARNEGIE MUSEUM. 



Other localities represented in the Carnegie Museum: 



Lake-drainage: 

 Lake Erie, Maumee Bay, Toledo, Lucas Co., Oliio; and La Plaisance Bay, Monroe Co., Michigan (C. 

 Goodrich). 



Ohio-drainage: 

 Ohio River, Toronto, Jefferson Co., Ohio; St. Marys, Pleasants Co., West Virginia; Portland, Meigs 



Co., Ohio; Portsmouth, Scioto Co., Oliio. 

 Pocatalico River, Raymond City, Putnam Co., West Virginia. 



Tennessee-drainage : 

 Tennessee River, Florence, Lauderdale Co., Alabama (H. H. Smith). 

 Paint Rock River, Paint Rock, Jackson Co., Alabama (H. H. Smith). 

 Clinch River, Solway, Kuo.x Co.; Edgemoor and Clinton, Anderson Co., Tennessee. 



Western range: 

 Mississippi River, Muscatine, Muscatine Co., Iowa (Hartman collection); Moline, Rock Island Co., 



Illinois (P. E. Nordgren). 

 Meramec River, Meramec Highlands, St. Louis Co., Missouri (N. M. Grier). 

 Black River, Black Rock, Lawrence Co., Arkansas (H. E. Wheeler). 

 Spring River, Black Rock, Lawrence Co., Arkansas (A. A. Hinkley). 

 Wliite River, Cotter, Baxter Co., Arkansas (A. A. Hinkley). 

 Ouacliita River, Arkadelpliia, Clark Co., Arkansas (H. E. Wheeler). 

 Verdigris River, Inola, Rogers Co., Oklahoma (F. B. Isely). 

 Bayou Pierre, De Soto Parish, Louisiana (L. S. Frierson). 

 Sabine River, Logansport, De Soto Parish, Louisiana (L. S. Frierson). 



Alabama-drainage: 

 Forks of Black Warrior River, Walker Co., Alabama (H. H. Smith). 

 Coosa River, Wetumpka, Elmore Co.; Weduska Shoals and Wilsonville, Shelby Co.; Coosa Valley, 



Riverside, and Lock 4, St. Clair Co.; Fomljy Shoals, Calhoun Co.; Greensport, St. Clair Co.; 



Minnesota Bend, Cherokee Co., Alabama (H. H. Smith). 



Distribution and Ecology (See fig. 22) : Type locality, Ohio River, Letart Falls, 

 Meigs Co., Ohio (Rafinesque). 



In Pennsylvania this species is restricted to the large rivers, the Ohio and 

 Monongahela. I found it repeatedly in Beaver County, but it is rather rare. 

 Farther down it becomes more abundant in the Ohio. In general, it seems to be 

 restricted to the Ohio proper and a few of its larger tributaries, as the Muskingum 

 (Dewey, 1856) and Scioto. Sterki (1907a) says that it is not found in the Tus- 

 carawas, but in the Mahoning River. However I doubt the latter record, since 

 Dean (1890) does not mention it, and since it is absent in the Beaver and Mahoning 

 in Pennsylvania. The smallest stream in which I found this species, is the Poca- 

 talico River in West Virginia, tributarj' to the Kanawha, and here it was scarce, 

 and only occurred in the lower part of the stream. In Indiana also this species 



