ORTMANN: monograph op the naiades of PENNSYLVANIA. 235 



Concmaugh River, New Florence, Westmoreland Co. 



Loyalhanna River, Idlepark, Westmoreland Co. (D. A. Atkinson). 



Crooked Creek, Rosston, Armstrong Co. 



French Creek, Utica, Venango Co.; Cochranton, Meadville, and CambHdge Springs, Crawford Co. 



Connewango Creek, Russell, Warren Co. 



Monongahela-drainage : 

 Monongahela River, Charleroi, Washington Co. (G. A. Ehrmann). 

 Youghiogeny River, Boston, Allegheny Co. (D. A. Atkinson). 

 Cheat River, Cheat Haven, Fayette Co. 



Other localities represented in the Carnegie Museum: 



Lake-drainage: 

 Grand River, Cayuga, Haldimand Co., Ontario, Canada (C. Goodrich). 

 Sandusky River, Fremont, Sandusky Co., Ohio (C. Goodrich). 

 Maumee River, Defiance, Defiance Co., Ohio (C. Goodrich). 

 Raisin River, Monroe and Grape P. O., Monroe Co., Michigan (C. Goodrich). 

 Huron River, Newport, Monroe Co., Michigan (C. Goodrich). 

 Grand Rapids, Kent Co., Michigan (Hartman collection). 



Ohio-drainage: 



Ohio River, Congo, Hancock Co., West Virginia; Toronto, Jefferson Co., Ohio; St. Marys, Pleasants 

 Co., West Virginia; Parkersburg, Wood Co., West Virginia; Portland, Meigs Co., Ohio; Ports- 

 mouth, Scioto Co., Ohio. 



Tuscarawas River, Ohio (Holland collection). 



West Fork White River, Riverside, Green Co., Indiana (J. D. Haseman). 



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



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



Levisa Fork Big Sandy River, Prestonsburg, Floyd Co., Kentucky. 



Licking River, Farmer, Rowan Co., Kentucky. 



Mississippi and westward: 

 Kishwaukee River, Rockford, Winnebago Co., Illinois (P. E. Nordgren). 

 Mississippi River, Muscatine, ^Muscatine Co., Iowa (Hartman collection). 

 Meramec River, Meramec Higlilands, St. Louis Co., Missouri (N. M. Grier)."' 



Distribution and Ecology in Pennsylvania (See fig. 24) : A verj' common species 

 in western Pennsylvania, but restricted to the larger streams and some of the 

 larger tributaries. In the Ohio, Allegheny, and Monongahela, it is (or was) every- 

 where present, but in the two latter only up to a certain point. In the Allegheny 

 it goes up to Warren, and beyond, at least as far as Olean, Cattaraugus Co., New 

 York (Marshall, 1895), but is not found in the uppermost part m McKean Co., 

 Pennsylvania. In the Monongahela it has been found as high up as the Cheat, 



"' Mostly normal; but one specimen agrees with one of the Arkansas forms, with dark bold rays, 

 and pink nacre. 



