EPHEMEKIDA. 
5 
Besides tliis there is a subimago ç, in alcohol, wbicli specimen cannot be referred to 
any of the previously described species. It is found 17. VIII. 09 at the Kara river. 
Sparrea norvegica E.-Peters. 
Deutsche Ent. Zeitschr. 1909. Tromsö Museums Aarshefter 31 og. 32. 1910. 
Potameis élegans S. Bengtss. Lunds Univ. Arsskrift 1909. 
The genus and species are based upon specimens front Karasjok in Norwegian Fin- 
marken. Afterwards specimens bave been found in 
Sweden. In the collection there is 1 pinned specimen 
from the tundra of Kara, 13. VII. 09 and 1 3, subimago, 
in alcohol, from the Kara river, 22 . VII. 09. 
After having read S. Bengtsson’s description of 
the species and seen specimens from his collection, 
I hâve been convinced that Potameis elegans is the saine 
as Sparrea norvegica. 
Fig. 5. Sparrea norvegica E.-Pet er s. 6. 
a Penis from above. b Penis from side. 
Fam. Ametropidae. 
Genus Ametropus Al b. 
Ametropus fragilis Al b. 
Albarda, Ent. Monthl. Mag. 1878; Eaton, A rev. Mon. of recent Ephem. or Mayfl. 1983—88. 
As mentioned before, this species did not occur in the collection, but I hâve seen a 
single specimen, subimago, collected by Mr. Basile Bostanjoglo, Moscow,at the river Ular, 
48У 2 ° lat., Ural Government. The specimen has lost its legs and got the body accidentally 
corapressed, but I am inclined to consider the specimen as a A. fragilis. 
Genus Metretopus Etn. 
Eaton, Ent. Monthl. Mag. 1901 pag. 253. 
Bengtsson, Paläarktischen Ephemeriden, Lunds Univ. Arsskrift 1909. 
The description of this genus and species was based upon specimens found in Norway. 
Later on examples were discovered in several places in Sweden. 
I hâve several specimens before me. Dried and pinned: 2 35 aud 1 $ imag., lç subim. 
23. VIII. 1909 from, Jenser-Keu. In alcohol: 1 S, imag. 14. VIII. № 256 from the river 
Nemsi-jaha; lç subimag. 19. VIII. J\» 269 from the Pyderata river; 1 $ subim. 17. VIII. 
JVs 264 from the Pyderata river; 1 9 subim. 21 . VIII. № 277 from the river Niada-jaha; 
lç subim. 20. VIII from the Pyderata river. 
