212 MEMOIRS OF THE CARNEGIE MUSEUM. 



Cheat River, Jaco and Mont Chateau, Monongalia Co., West Virginia. 



West Fork River, Lynch Mines, Harrison Co.; West Milford, Harrison Co. (W. F. Graham); Lightburn, 



Lewis Co., West Virginia. 

 Little Kanawha River, Grantsville, Calhoun Co. ( W. F. Graham) ; Burnsville, Braxton Co., West Virginia. 

 Elk River, Shelton and Clay, Clay Co.; Gassaway and Sutton, Braxton Co., West Virginia. 

 Licking River, Farmer, Rowan Co., Kentucky. 



Tennessee-drainage : 

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



collection). r 



Bear Creek, Burleson, Franklin Co., Alabama (H. H. Smith). 

 Elk River, Estill Springs, Franklin Co., Tennessee (H. H. Smith). 

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

 South Chickamauga Creek, Ringgold, Catoosa Co., Georgia. 

 French Broad River, Boyd Creek, Sevier Co., Tennessee. 

 Holston River, Mascot, Knox Co.; Tiirley Mill, Noeton, and Holston Station, Grainger Co.; Austin 



Mill, Hawkins Co., Tennessee. 

 South Fork Holston River, Pactolus, Bluff Citj^, and Emmett, Sullivan Co., Tennessee. 

 North Fork Holston River, Rotherwood, Hawkins Co., Tennessee; Hilton, Scott Co., and Mendota, 



Washington Co., Virginia. 

 Clinch River, Edgemoor, Clinton, and Offutt, Anderson Co.; Black Fox Ford, Union Co.; Clinch River 



Station, Claiborne Co.; Oakman, Grainger Co., Tennessee; Speers Ferry and Clinchport, Scott 



Co., Virginia; St. Paul, Wise Co.; Fink and Cleveland, Russell Co., Virginia. 

 Emory River, Harriman, Roane Co., Tennessee. 

 Powell River, Combs, Claiborne Co., Tennessee. 



Distribution and Ecology in Pennsylvania (See fig. 22) : In Pennsylvania this 

 is preeminent!}^ a species of smaller rivers and creeks. It is very rare in the Alle- 

 gheny below Oil City, and has not been found in the Ohio. In the Monongahela 

 it must also have been rare. But in the tributaries it is abundant, with the ex- 

 ception of the smallest headwaters. It goes far eastwards toward the divide in 

 Indiana, Westmoreland, and Somerset Counties. It is also found in Cheat River 

 and the upper Monongahela in West Virginia. 



Furthermore it occurs in Lake Erie and its tributary, Conneaut Creek, and 

 may have crossed into the lake-drainage from the upper Beaver-drainage. 



That it avoids large rivers holds good further down the Ohio, although it is 

 not entirely absent there. Its ecological preferences are distinctly for riffles and 

 strongly flowing water, with finer or coarser, but firmly packed gravel. Very 

 frequently it is found along the edges of Dianthera-pedches, always in a lively 

 current. In Lake Erie it is chiefly found on the North shore of Presque Isle Bay, 

 in two or three feet of water, on sandy or slightly gravelly bottom, exposed to the 

 moderate surf of the bay, but it is not abundant there. Scammon (1906) says 

 that this species prefers (in Kansas) the smaller streams. 



