BENGTSSON, AN ANALYSIS OF DESCRIB. SCANDIN. EFHEMERIDA. 9 



in the larva »les anneaux du ventre» are said to be »separés 

 les uns des autres par des bändes transversales noiråtres, et 

 tout le long du dos ils ont une suite de taches de la méme 

 couleur» (1. c. pag. 647), whereas I have found these mark- 

 ings of the larva påle yellow (botli in living specimens and 

 specimens in spirit). From the above said it also follows, 

 that LepiojjJilehia Meyeri Eat. is synonymous with the species 

 in question. The types of this species, which I have re- 

 ceived for examination, have not given any guidance for the 

 determination of the species. The fact is that all 3 specimens 

 — all imago ^ — proved to be spurious types, because none 

 of the specimens agreed with De Geer's description and fi- 

 gures of this species. They are obviously not the animals, 

 on which his description is bas:ed, but belong to quite another 

 species and to the same as De Geer's N:o 4. 



3. Ephémere ä ceinture hlanche (1. c. pag. 650 — 652. N:o 3). — 

 This species was låter named Ephemera cmcta by A. J. Ret- 

 zius^ If it could be said about the preceding species, that 

 it has been a subject for very different opinions, it is just 

 the contrary with regard to the species in question. Since 

 PiCTET^ interpreted it as a Potamanthus (Leptophlebia Westw.) 

 it reappears uncritically by all låter authors under the name 

 of Leptophlebia cincta. It seems curious to me that such a 

 determination could have been accepted. The individual, on 

 which the description is founded, has obviously been a male, 

 as De Geer also expressly says. The characters, which have 

 struck De Geer as the most »remarquables», seem in the 

 first place to have been the eyes, which he describes and 

 reproduces (Pl. 17. Fig. 18) as distinct, typical »yeux en 

 turban». Concerning the hind wings he says: »les ailes in- 

 férieures sont si petites, qu'il faut les chercher pour les voir», 

 and that also the presence of small intercalar veinlets on the 

 före wings have not escaped his attention, ought probably 

 to be regarded as clear from fig. 18, which shows us such 

 veinlets well indicated — all characters, which very defini- 

 tely show, that the species cannot belong to the genus Lepto- 

 pJdebia, but must be arranged in the family Baetidce. Also 

 the genus is not doubtful, because the figures show us the 



^ A. J. Retztus, c. De Geer's Genera et Species Insect. Lipsi» 1783. 

 p. 57. 182. 



- 1. c. pag. 219. 



