ORTMANN: monograph of the naiades of PENNSYLVANIA. 17 



Ohio-drainngc: 



Tuscarawas Hivor, Ohio (Ildlland collection). 



Wolfp Creek, Washington Co., Ohio (W. F. (iraliam). 



Cliillicothe, Ross Co., Ohio (Hartman collection). 



Ohio Canal, Columbus, Franklin Co., Ohio (Smith collection). 



Scioto River, Kenton, Hardin Co., Ohio (C. Goodrich). 



Wabash River, New Corydon, Jay Co., Geneva, Adams Co., and Bluffton, Wells Co., Indiana (C. Good- 

 rich). 



Little Kanawha River, Burnsville Braxton Co., West Virginia. 



North Fork Hughes River, Cornwallis, Ritchie Co., West Virginia. 



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



Coal River, Sproul, Kanawha Co., West Virginia. 



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



Licking River, Farmer, Rowan Co., Kentucky. 



Drainage of iippcr Mississippi and Red River of the North. 



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



Sheyenne River, Argusville, Cass Co., North Dakota (S. IM. Edwards). 

 Western and Soulhirestem Range. 



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



Wakarusa River, Lawrence, Douglas Co., Kansas (R. L. Moodie donor). 



Wea Creek and Bull Creek, Miami Co., Kansas (C. Goodrich donor) (Osage drainage). 



Neosho River, Burlington, Coffey Co., Kansas (R. L. Moodie donor). 



Terra Noir Creek, Mount Zion, Clark Co., Arkansas (H. E. Wheeler). 



Big Deceiper Creek, Gum Springs, Clark Co., Arkansas (H. E. Wheeler). 



Chikaskia River, Tonkawa, Kay Co., Oklahoma (F. B. Isely). 



Illinois River, Talequah, Cherokee Co., Oklahoma (F. B. Isely). 



Blue River, Durant, Bryan Co., Oklahoma (F. B. IseljO- 



Note: The specimens from Arkansas and Oklahoma are absolutely indistinguishable from the 



Pennsylvanian form in shape and anatomy, but have generally a more brilliant, shining, reddish epidermis. 



Distribution and Ecology in Pennsylvania (See fig. 3) : In our state F. flava 

 is eminently characteristic of smaller streams, avoiding the larger rivers, although 

 it has been found in the Allegheny, Monongahela, and Ohio. It is most abundant 

 in the southwestern section of the state (Monongahela-drainage) , and locaUj' is 

 rather plentiful, as for instance in Raccoon, Tenmile, and Dunkard Creeks. In the 

 Allegheny River it is rather scarce, but is found in considerable numbers in Crooked 

 Creek. Nevertheless elsewhere in the Allegheny-drainage it is absent, which is 

 especially true of French Creek and the uppermost Allegheny, where there is 

 a rich fauna still present, which has been well investigated. It is also alisent in 

 the whole Beaver-drainage. 



It is hard to say what may have caused this peculiar condition. Yet atten- 

 tion should be called to the fact that the Beaver River and French Creek belong 

 to the Glacial area, and that all creeks in Pennsjdvania, in which this species is 

 found, arc entirely outside of this area. ■ In the Kiskiminetas, Red Bank, and 



