BENGTSSON, AN ANALYSIS OF DESCRIB. SCANDIN. EPHEMERIDA. 11 



occurring in Sweden, to whicb the description can be applied. 

 The examination of the type specimen received, which con- 

 sisted of imago J" and which agrees entirely with De Geer's 

 description, has further strengthened the correctness of such 

 an interpretation. The species in question was named Epheni. 

 fiisco-grisea already by Retzius ^ and ought, therefore, to 

 take the name of Ecdyurus fusco-griseus (Retz,). Cf. below 

 under Fabricius N:o 7, Ephemera venosa. 



5. Ephémere å deux ailes d; å bände brune (1. c. pag. 656 — 

 660. N:o 5) is Cloeon dipterum (Lin.), as it has generally been 

 interpreted and as also the type specimens confirm. 



TIT. O. F. Muller. 



1. Ephemera danica (Fauna Ins. Friedrichsd. (1764) p. 63. 

 N:o 554. — Zool. Dan. Prodrom. p. 142. N:o 1640). — The 

 only character in the short diagnosis, that is mentioned as 

 distinguishing this species from the following one (E. vidgata), 

 is »alis pallide aureis». Though this character and »E. vul- 

 gata major», added in Fauna Ins. Friedr., does not suffice 

 to distinguish the two species from each other, the one in 

 question surely may be explained as Ejohemera danica auct. 

 — if there has been two separate species — as it is the only 

 species of Ephemera and of May-flies on the whole, hitherto 

 found in Denniark, to which the description Avill apply, and 

 it therefore may retain its old-established name. Pictet's 

 Ephemera da^iica, that this has identified with Muller's 

 species with the same name, is another species, as Eaton 

 already has shown. 



2. Eph. vulgata (Zool. Dan. Prodrom. p. 142. N:o 1641) 

 is Ephemera vidgata Lin. 



3. Eph. margiiiata (1. c. pag. 142. N:o 1642) is undoub- 

 tedly Leptophlebia marginaia (Lin.) and not Poiamanthus lutens 

 (Lin.), as Eaton is disposed to determine it, which species 

 has not, however, been found in Denmark. 



4. Eph. plumosa (1. c. pag. 142. N:o 1643) is a Ccenis 

 Steph., subimago, probably Ccenis horaria (Lin.) (= dimi- 

 diata Steph.), 



' 1. c. pag. 57. X:o 183. 



