EPHEMERIN.E. 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 -fits cum ; mesothorax non vittatus ; 

 setcs caudales fuscce ; pedes violaceo-fusci ; ala indistincte 

 reticulata?, reyione subcostali vix colorata ; ala subimaginis 

 maculata:. 



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



17, f. 11—16. Berk. Syn. i. 150. Stew. El. Nat. Hist. ii. 



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

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

 Baetis fusa, Burnt. Handb. Ent. ii. 800, 1. 

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

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



1—3. 



Europe. 



5. Potamanthus talcosus. 



Piceo-fuscus ; abdominis apice pedibus setisque luridis ; alls 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 ; alls hyalinis pallide lutescentibus haud maculatis, 

 anticarum costa ad apicem luteo-fuscescenie. 



3 a 3 



