BENGTSSON, AN ANALYSIS OF DESCRIB. SCANDIN. EPHEMERIDA. 7 



or othervvise seen a Swedish specimen. Ltnné's description 

 obviously refers to subimago. 



10. E^^h. mutica (Fauna Suec. p. 377. N:o 1479). — In 

 System. Nat. Ed. 12 Linné corrected the wrong character 

 »cauda mutica» in 10 Edit. of System. Nat. and in Fauna 

 Suec. to »cauda biseta» and changed, in connection witli 

 this, the name of the species to siriata (Sy st. Nat. Ed. 12. 

 p. 907. N:o 10). Imagines of ^ and 5 are described. Eaton 

 has, hesitatingly, interpreted the species as Baetis pumilus 

 BuRM., with which already Pictet ^ considered it »voisine». 

 Though nothing is mentioned in the description about the 

 hind wings, it seems to me impossible to refer the species 

 to any other genus than BaHis. Owing to the fact that 

 both sexes are described, the determination of the species 

 is rather easy. It seems to me that of the characters men- 

 tioned »femina corpore opaco subrufescente» and »alse hya- 

 linje . . . vasis minime reticulatis» decidedly speak in favour 

 of the interpretation of this species as synonymous with 

 Baetis pumilus Burm., for in ^ of this very species the ner- 

 vures are characteristically colourless and, therefore, less 

 prominent and the body, especially abdomen, above reddish 

 brown. The words »capitis tubera oculis minora» are appli- 

 cable only to $ and to its two large upper ocelli, not to 

 the turbinate eyes of the male, which, as far as I know, in 

 the family Baetidce, are always larger than the lower eyes. 

 The species in question should consequently, no doubt, take 

 LiNNÉ's name and certainly the oldest one and be named 

 Baetis Tnuticus, with application, also in a case like this, of 

 the rule of priority. The species occurs in Sweden, spread 

 from Skåne to Lappla,nd. 



II. De Geer. 



1. Ephémere commune (Mem. d. Ins. Tom. 2. Part 2. 

 p. 621 — 646. N:o 1). — It is Ephemera vidgata Lin., as also 

 the type specimens show. 



1 1. c. pag. 270. 



