AEKiy FÖR ZOOLOGI. 



BAND 7. N:o 36. 



All analysis of tlie Scaiuliiiayiaii Species of 

 Epliemerida described by older autliors. 



By 

 SIMON BENGTSSON. 



Communicated Juni 5th by Che. Aurivillius and Y. Sjöstedt. 



In preparing a monograph on the Swedish forms of the 

 group of Ephcmerida I have devoted very much attention 

 to the synonymic of the species and, in the first place, I 

 have tried to analyze the forms described by the older 

 Swedish authors von Linnér de Geer^ and Zetterstedt^ 

 Considering the great importance, which the identification 

 of the species described by older authors has for the nomen- 

 clature of the forms, a fixation of the synonymy cannot fail 

 to be also of great scientific interest. 



Many of the species described by the authors mentioned 

 have, both among older and låter authors, been a subject 

 for very diverging opinions, while, concerning others, tiie 

 views have agre^d very much. As long as, however, the 

 May-flies of our country were only imperfectly examined, the 

 interpretation of the forms lacked its necessary, solid founda- 

 tion and could, in many cases, nothing but remain uncertain 

 and doubtful, to which, of course, must also be added, as 



^ c. VON Linné, Fauna Suecica. Ed. II. Stockh. 1761 and Systema 

 Naturce. Ed. XII. Tom. I. Pars 2. Holmiae 1767. 



^ Charles de Geer, Memoires pour servir å Thistoire des Insectes. 

 Tom. II. Pars 2. Stockh. 1771. 



^ J. W. Zetterstedt, Insecta Lapponica. Lipsia? 1840. 



Arkiv för zoologi. Band 7. X:o 36. 1 



