168 MEMOIRS OP THE CARNEGIE MUSEUM. 



Localities in Pennsylvania represented in the Carnegie Museum: 



Slicnaugo River, Sharpsville, Shenango, and Jamestown, Mercer Co.; Linesville, Crawford Co. 



Pymatuning Creek, Pymatuning Township, Mercer Co. 



Little Shenango River, Greenville, Mercer Co.; Hadley, Mercer Co. (D. A. Atkinson). 



Randolph Run, Hartstown, Crawford Co. 



Conneaut Lake and Conneaut Outlet, Crawford Co. 



Cussewago Creek, Mosiertown, Crawford Co. (H. &. L. Ellsworth). 



French Creek, Meadville, Crawford Co. 



Conneaut Creek, West Springfield, Erie Co. 



Other localities represented in the Carnegie Museum: 



Lake-drainage: 

 Tributary of Lake Ontario, Cobourg, Northumberland Co., Ontario, Canada (D. Stewart). 

 St. Lawrence River, Clayton, Jefferson Co., New York (Miss A. H. Robinson). ^2° 

 Genesee River, Rochester, Monroe Co., New York (R. H. Santens). 

 Swan Creek, Toledo, Lucas Co., Ohio (C. Goodrich). 

 Cedar Creek, Jerusalem Township, Lucas Co., Oliio (C. Goodrich). 

 Ten Mile Creek, Silica, Lucas Co., Ohio (C. Goodrich). 

 Silver Creek, Williams Co., Ohio (C. Goodrich). 

 Otter Creek, Monroe Co., Michigan (C. Goodrich). 

 Raisin River, Tecumseh, Lenawee Co., Michigan (C. Goodrich). 



Ohio-Mississippi-drainage: 

 Tuscarawas River, Ohio (Holland collection). 

 Winona Lake, Kosciusko Co., Indiana (E. B. Williamson). 

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

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

 Fleming Creek, Pleasant Valley, Nicholas Co., Kentucky. 

 Cumberland River, Orby, Bell Co., Kentucky. 



Western: 

 Hinkston Creek, Columbia, Boone Co., Missouri (D. K. Greger). 

 Smoky Hill River, Logan Co., Kansas (C. W. Gilmore). 

 Lodgepole Creek, Julesburg, Sedgwick Co., Colorado (G. H. Clapp, donor). 

 Big Thompson Creek, Loveland, Larimer Co., Colorado (A. Koenig). 



Distribution and Ecology in Pennsylvania (See fig. 16) : This species is found 

 exclusively in the northwestern section of our territory, mainly in the headwaters 

 of the Beaver system, and of French Creek. In addition it occurs in Conneaut 

 Creek, a tributary of Lake Erie. Thus it obviously falls into the same category 

 as some other species before mentioned. Apparently its metropolis in our state is 

 the upper Shenango, where it is abundant, for instance at Linesville and in Pyma- 

 tuning Creek. It has never been found below Sharpsville, just below the mouth 

 of Pymatuning Creek. In French Creek proper it is rare (only one found at 



'^'' Dwarf, pale race, possibly the var. modestus (Lea). 



