562 ORTMANN— NAYADES OF 



rest in the high mountains of North Carohna, and developed there 

 into a good species. 



The type locahty is French Broad and Swananoa rivers, Ashe- 

 ville, Buncombe Co., N. Car. I have not been able to find this species 

 there, for the French Broad is polluted in this region (lumher indus- 

 tries on Davidson River). But I have rediscovered it in Big Pigeon 

 River, at Canton, Haywood Co., N. Car., where it is not rare at the 

 proper places. 



Specimens from " North and South Fork of the Cumberland 

 River," referred to this species, do not belong here, but are a form of 

 A. marginata, with well-developed rugosities upon the posterior 

 slope {atropurpnrea Raf., '31). 



Genus: Pegias Simpson (1900). 

 Ortmann, '14, pp. 45 and 65 (as subgenus). 



On account of the very peculiar glochidia I consider it better 

 to retain Pegias as a genus, closely allied to Alasmidonia. 



43. Pegias fabula (Lea), 1836. 



Margarita (Margaritana) fabula Lea, '36. — Alasmidonia fabula 

 Ortmann, '13&, p. 311. — Alasmidonta (Pegias) fabula Ortmann, 

 '14, p. 65 (anatomy).- — Pegias fabula Simpson, '14, p. 473. 

 A rare species in the upper Tennessee drainage, apparently pre- 

 ferring smaller streams. Possibly it has been often overlooked on 

 account of its small size and the peculiarity of being generally much 

 eroded. I know it from the following localities. 



Wallen Creek, Lee Co., Va. (Walker coll.) ; Powell River, Dry- 

 den, Lee Co., Va. ; Big Mocassin Creek, Mocassin Gap, Scott Co., 

 Va. ; North Fork Holston River, Saltville, Smyth Co., Va. ; North 

 Fork Holston River, Holston, Washington Co. (Walker coll.) and 

 Mendota, Washington Co., Va. ; South Fork Holston River, Pac- 

 tolus, Sullivan Co., Tenn. 



Type locality: Cumberland River, Tenn. 



Genus: Stropiiitus Rafinesque (1820). 

 Ortmann, '12b, p. 299. 



