EPHEMERlNjE. 541 



Var. ? Ephemera rufa, Ramb. Hist. Nat. Ins. Neur. 296, 8. 



A little larger than Cloeon Diptera : red : body thick, rather short, 

 rather dark red above : eyes very prominent on the outer side : fila- 

 ments three, blackish: legs rather dark red, perceptibly shorter than 

 the body, with 5-jointed tarsi ; anterior legs brownish : wings hya- 

 line, long, hardly broad, yellowish at the base and along the fore 

 border ; reticulation brownish, tolerably distinct ; veins yellow to- 

 wards the base. 



Tarbes. 



4. POTAMANTHUS GEERII. 



Corpus longum,plerumque nigro-fuscum ; mesothorax non vittatus ; 

 setce caudales fuscce ; pedes violaceo-fusci ; ala indistincte 

 reticulates, reyione subcostali vix colorata ; alas subimaginis 

 maculates. 



Ephemera vespertina, Linn. Syst. Nat. ii. 906. Deg. Ins. ii. 646, pi. 



17, f. 1116. Berk. Syn. \. 150. Stew. El. Nat. Hist. ii. 



21 1 . Zett. Ins. Lap. 1044, 5. 

 Ephemera albipennis, Relz. Gen. de Deg. 57, 181 . 

 Bae'tis fusa, Burm. Handb. Ent. ii. 800, 1. 

 Leptophlebia, Westw. Intr. Class. Ins. ii. 31 . 

 Potamanthus Geerii, Pictet, Hist. Nat. Neur. Eph. 211, 4, pi. 26, f. 



13. 



Europe. 



5. POTAMANTHUS TALCOSUS. 



Piceo-fuscus ; abdominis apice pedibus setisque luridis ; alis hya- 

 linis immaculatis. 



Ephemera talcosa, Steph. III. Brit. Ent. Mand. vi. 57, 4. 

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



England. 



6. POTAMANTHUS STIGMA. 



Piceo-fuscus ; abdomine pallidiore ; pedibus setisque luridis imma- 

 culatis ; alis hyalinis pallide lutescentibus haud maculatis, 

 anticarum costa ad apicem luteo-fuscescente. 



3 A 3 



