542 EPHEMERIN.E. 



Ephemera stigma, Steph. III. Brit. Ent. Mand. vi. 56, 3. 

 Potamanthus stigma, Pictet, Hist. Nat. Neur. Eph. 235. 



P. Geeri ? 

 England. 



7. Potamanthus dispar. 



Piceo-niger ; abdominis basi pedibusque pallide rufo-piceis ; setis 

 luridis fusco subannulalis. 



Ephemera dispar, Steph. III. Brit. Ent. Mand. vi. 58, 8. 

 Potamanthus dispar, Pictet, Hist. Nat. Neur. Eph. 234. 



P. Geeri ? 

 England. 



8. Potamanthus castaneus. 



Corpus longum, plerumque nigro-fuscum ; mesothorax vitta discali ; 

 seta caudales fuscce ; pedes omnino fusci ; alarum vena in- 

 distincte reticulata, regione subcostali vix colorata ; alee sub- 

 imaginis maculates. 



Potamanthus castaneus, Pictet, Hist. Nat. Neur. Eph. 215, 5, pi. 

 26, f. 4, 5. 



Switzerland. 



9. Potamanthus brunneus. 



Corpus longum, plerumque nigro-fuscum; setce caudales Jlaves- 

 centes ; alee indistincte reticulata, regione subcostali vix colo- 

 rata ; alee subimaginis cinerece, unicolores. 



Potamanthus brunneus, Pictet, Hist. Nat. Neur. Eph. 217, 6, pi. 

 27. 



Switzerland. 



