ORTMANN: monograph of the naiades of PENNSYLVANIA. 287 



West Branch Nimishillen Creek, Canton, Stark Co., Ohio. 



Tuscarawas River, Ohio (Holland collection). 



Wolfe Creek, Wolfe Creek P. 0., Wasliington Co., Oliio (W. F. Graham). 



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



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



Ohio River, Toronto, Jefferson Co., Ohio. 



West Fork River, Lynch Mines, Harrison Co.; Lightburn and Weston, Lewis Co., West Virginia. 



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. 



Mud River, Milton, Cabell Co., West Virginia. 



Licking River, Farmer, Rowan Co., Kentucky.'** 



Muscatine Slough, Muscatine, Muscatine Co., Iowa (Hartmau collection). 



Mississippi River, Moline, Rock Island Co., Illinois (P. E. Nordgren). 



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



West of Mississippi: 

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

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

 Spring River, Williford, Sharp Co., Arkansas (H. E. Wheeler). 

 Ouachita River, Arkadelphia, Clark Co., Arkansas (H. E. Wheeler).'*' 

 Fourteen IMile Creek, McBrides Switch, Wagoner Co., Oklahoma (F. B. Isely).'" 



Distribution and Ecology in Pennsylvania (See fig. 30): This is a common 

 species in western Pennsylvania, although not found ever^n^rhere. It is averse 

 to large rivers, and, if at all present in them, is either rare, or is found under special 

 conditions, in smaller branches of the main river (as for instance at Neville Island). 

 On the other hand, it is very abundant in some of the smaller streams, as for in- 

 stance, in the whole Beaver-drainage. It avoids certain streams, and this is espe- 

 cially true of mountain-streams,- such as Cheat River and the Kiskiminetas- 

 drainage.'^^ It occurs in the only tributary' of Lake Erie, in our state, which 

 contains shells (Conneaut Creek). 



'** I have seen this species in Oil Creek, Orlando, Lewis Co., West Virginia. 



"* I have also seen specimens in Fleming Creek, Pleasant Valley, Nicholas Co., Kentucky. 



'" Some specimens from Ouacliita River and from Oklahoma are quite typical, but Wheeler (1918, 

 p. 117) does not report L. luteola from Clark Co., Arkansas. In this region peculiar forms turn up, 

 some of which develop reddish color in the nacre, and others intergrade in the direction of L. hydiana 

 (Lea). I omit these since I have not enough material to clear up their affinities. 



'** The fauna of tliis system is poorly known. However, remarkablj' enough, this species has not 

 been listed by Harn (1891), whose material seems to have come chiefly from the Kiskiminetas-Conemaugh- 

 drainage. This serves to substantiate the above conclusion, since I never found this species in the two 

 creeks of this region, where I have been able to collect the fauna (upper Loyalhanna and Quemahoning). 

 Also in Yellow and Two Lick Creeks, where a fragmeutarj- fauna has been observed, this species was 

 not present. 



