BENGTSSON, AN ANALYSIS OF DESCRIB. SCANDIN. EPHEMERIDA. 19 



genus Ceyitroptilum Eaton, and tlie dark wings, that are said 

 to be »rödskinnende som Kaaber», an subimago. Against the 

 last mentioned supposition, however, svvears the length of the 

 setse, which are described as »dobbelt saa länge som Kroppen». 

 The species may surely be referred to C entroptilum diaphanum 

 (MiJLL.) (luteolum auct.). 



3. Eph, hioculata (1. c. pag. 91. N:o 133). — The character 

 »undervingerne afJang runde og meget smaa>> indicates the 

 genus Baetis, as also the long setse, that are described as 

 »2 Gange saa Jange som Kroppen» indicate imago and the 

 great eyes »neden til smalle» J^. The species has commonly 

 and already by Ström been identified with Ephemera hiocu- 

 lata Lin., but »overlivet» (== thorax) is described as »oventil 

 sort», while Linné for his species, which is also an imago ef, 

 gives the character »totum corpus . . . pallide flavescens». 

 It seems to me that the description applies best to Baetis 

 tenax Eat. 



4. Eph. ciliata (1. c. pag. 91. N:o 134). — Like N:o 1 and 

 Nio 2 this is a species, first described by Ström. It surely, 

 like N:o 3, belongs to Baetis Leach and the description has 

 evidently been based on the subimago-stage. Wallengren 

 regards it as identical with Baetis pumilus Burm., an opinion, 

 with which also Eaton ^ hesitatingly agrees. This seems 

 rather possible, even if perhaps the character »lidet större 

 eud Culex vulgaris'> combined with the other characters rather 

 applies to Baetis Wallengreni Bgtn. 



VII. H. D. J. Wallengren. 



1. Epthemera vulgata L. (Förteckning på de Ephemerider, 

 som hittills blifvit funna på Skandin. halfön. Entom. Tidskr. 

 Årg. 3. 1882. p. 175). — Many specimens in the collection, all 

 belonging to this Linnean species. 



2, Eph. lineata Eaton (1. c. pag. 175). — In the collec- 

 tion are three somewhat defective specimens, all labelled in 

 Wallengren's hand »Ephemera lineata Eat. subimago» and 

 the locality »Ifösjön 7—81». All the three specimens belong 

 to Ephemera vulgata Lin. 



^ Revis. Monogr. p. 167, 



