BENGTSSON, AN ANALYSIS OF DESCRIB. SCANDIN. EPHEMERIDA. 1 3 



probable, that it is the latter species that Muller has had 

 before him at the description, and that accordingly £'. Z?//eoZa 

 (N:o 1649) is $ of the same sipecies diS E. diaphaiia {N:o 164:1), 

 which represents J". As E. diaphana, as I ha ve shown above, 

 can not be determined as any other species than Centro- 

 ptilum luteolinn auc., but the determination of E. luteola as 

 the same species is somewhat incertain, the species accordingly 

 should take the name of Centroptilum diaphaniim (Mull.), as 

 also the rule of priority bids. 



11. Eph. rufida (I. c. pag. 143. N:o 1650). — This spe- 

 cies belongs to the genus Cloeon Leach, but can not be de- 

 termined as the Cl. rufidum of Eaton and other modern 

 authors, as this species is not found in Denmark^. The dia- 

 gnosis and especially the character »setis annulatis», which 

 is evidently taken as a contrary conception to »setis albis», 

 »setis immaculatis», can of the Dacuish Cloeon-sipecies only be 

 applied to CL dipterum (Lin.), imago J^, which by Muller 

 also is directly referred to the $, described under the fol- 

 lowing number (1651). 



12. Eph. striata (I. c. pag. 143. N:o 1651) is Cloeon di- 

 pterum (Lin.), imago $. 



13. Ej^Ti. annulata (1. c. pag. 143. Nio 1652) is the same 

 species as N:o 12. 



14. Eph. horaria (1. c. pag. 143. N:o 1653). — This is 

 probably Ccenis horaria (Lin.), as regards the setge, a mu- 

 tilated specimen. 



IV. J. C. Fabricius. 



1. Ephemera vulgata (Entom. System, p. 68. N:o 1) is 

 Ephemera vulgata Linné. 



2. Eph. lidea (1. c. pag. 68. N:o 2). — Like Linné's spe- 

 cies with the same name^, as identical with which Fabricius 

 considers his species, it has been identified as Potamanthiis 

 lutens auct. by Pictet^ and recent authörs in general. This 



^ The species, described by EsB. Petersen in Danmarks Fauna 8 : 

 Guldsmede, Dognfluer, Slorvinger etc. p. 97 as Cl. rufidum Mull. belongs 

 to CloHon hifidum (see Neue Ephemeriden etc. p. 109). 



^ Linné, Syst. Nat. Ed. XII. Tom I. Pars II. p. 90G. X:o 2. 



' 1. c. pag. 132 f. and 205. 



