540 EPHEMERIN^. 



Turt. Syst. Nat. iii. 393. Blanch. Hist. Nat. iii. 54, 1. Steph. 



ILL Brit. Ent. Hand. vi. 57, 5. Ramb. Hist. Nat. Ins. 



Neur. 294, 2. 



Ephemera hyalinata, Panz. explicat. Schceff. tabul. 

 Baetis margiualis? Burm. Handb. Ent. ii. 801, 3. 

 Potamanthus luteus, Pictet, Hist. Nat. Neur. Eph. 2052. 



a. England. Presented by F. Walker, Esq. 



Subimago? Ephemera chloretica, Ramb. Hist. Nat. Ins. Neur. 

 296, 9. 



A little larger than Cloeon Diptera, resembling E.flavicans, R. : 

 yellow, with a dull red band on the dorsal part of the abdomen be- 

 neath, red on the prothorax : filaments three, longer by half than 

 the body, dull, with blackish rings, slightly downy : anal appen- 

 dages rather thick, moderately attenuated and tapering at the tips : 

 legs yellow, much shorter than the body ; feet 4-jointed, with in- 

 distinct brownish rings; anterior legs slightly reddish: wings very 

 slightly yellowish, a little more tinged at the base and along the 

 fore border; reticulation yellowish ; membrane slightly opaque. 



Paris. 



3. POTAMANTHUS MARGINATUS. 



Corpus obscurum; alee indistincte reticulata, regions subcostali 

 nigricante. 



Ephemera marginata, Linn. Syst. Nat. Ed. 12, ii. 906, 3. Geoffr. 



Hist. Ins. ii. 239, 3. Mull. Zool. Dan. Prodr. 142, 1642. De 



Vill. Linn. Ent. iii. 17, 3. Oliv. Enc. Meth. vi. 4 17, 3. Fabr. 



Ent. Syst. ii. 69, 4. Cederhielm, Faun. Ingr. Prod. 134, 408. 



Schrank, Faun. Boic. 1941. Stew. Elem. Nat. Hist. ii. 211 ? 



Shaw, Gen. Zool. vi. pi. 81, fig. inf.? Walck. Faun. Par. ii. 



8, 3. Latr. Hist. Nat. Ins. xiii. 95, 3. Steph. III. Brit. Ent. 



Hand, vi. 57, 6. Blanch. Cours Hist. Nat. iii. 54, 3. 

 Ephemera procellaria, Roesel, Ins. ii. pi. 12, f. 1,2. 

 Ephemera viridescens, Fourcr. Ent. Par. 351, 3. 

 Potamanthus marginatus, Pictet, Hist. Nat. Neur. Eph. 208, 3, pi. 



25, f. 4, 5. 



a. England. Presented by F. Walker, Esq. 



b. England. 



