16 ARKIV FÖR ZOOLOGI. BAND 7. NIO 36. 



E. horarice». With the support of this comparison and Fa- 

 BRicius' quoting of Linné's species of the same name, it 

 probably must be identified with Ccenis horaria (Lin.) ( = 

 dimidiata Steph.), though it is said to have ^cauda biseta». 



12. Eph. cidiciforrnis {]. c. pag. 71. N:o 14). — Onaccount 

 of the short, rather insignificant diagnosis, impossible to 

 determine, like Linné's species of the same name. 



13. Eph. striata (1. c. pag. 71. N:o 15). — Dubious. Pos- 

 sibly identical with Linné's species of the same name, i. e. 

 Baetis muticiis (Lin.), which is given as identical. 



14. Eph. diptera (1. c. pag. 71. N:o 16) is Cloeon dipterum 

 (Lin.), imago $. 



V. J. W. Zetterstecit. 



1. Ephemera vulgata (Insecta Lappon. p. 1044. N:o 1). — 

 This species is represented in the coUection by 2 imagines J^ 

 and 1 subimago ^, which all are Ejjhemera vidgata Linné. 



2. Eph. marginata (1. c. pag. 1044. N:o 2). — All the 

 specimens, 2 imagines J^ and 1 im. 2, are Leptophlebia mar- 

 ginata (Lin.). 



3. Eph. hyalinata (1. c. pag. 1044—45. N:o 3). — Eaton 

 and recent authors ref er this species to »Leptophlebia cincta 

 Retz.», All the specimens of the principal form, 3 im. J^ 

 and 1 im. $> belong to Euphyurus albitarsi s Bgt:^ , var.\ i. e. 

 Euphyurus vespertinus (Lin.), ef. above under Linné N:o 3. 

 — Var. b., represented by 1 im. ^, is Leptophlebia Strandii 

 Eat.^ 



4. Eph. halterata (1. c. pag. 1045. N:o 4). — Eaton has 

 identified this species with Ephemera halterata Fabr. and ac- 

 cording to his låter determination in Revis. Monogr. conse- 

 .quently referred it to the genus Cceiiis. Wallengren^ has 

 referred it to Leptophlebia cincta (Retz.). — All the specimens 

 in the collection are in a fragmentary condition. The spe- 

 cimen, signed ^T ^^^ bearing the label »Muonioniska», is 



^ S. Bengtsson, Beiträge z. Kenntn. d. paläarkt. Ephemeriden p. 5. 

 "^ A. E. Eaton, Entom. Monthl. Magaz. Ser. 2. Vol. XII. London 190L 

 p. 253. 



^ H. D. J. Wallengren, Förteckn. etc. p. 176. 



