Ephemerida. 
By Esben - Petersen, Silkeborg-. 
The collection of Ephemerida, which I received through Dr. Philipp Zaitzev, to 
whom I am very much indebted and thaukful for forwarding it to me, is very interesting. 
It showed that the Epheraerid Fauna of the investigated localities is very much like that 
of Arctic Scaudinavia. We find again 3 généra: Ghitonophora, Sparrea and Metretopus 
which hâve hitherto only been found in Norway and Sweden, Besides that we see that the 
Arctic Ephemerid Fauna is far from being sufficiently explored, and that we may expect to 
find many new forrns, as soon as the researches are proceeded with. 
The species found in the collection were the following: 
1. Ghitonophora Aroni Eat. 
2. Baëtis ver mis Curt. 
3. Sparrea norvegica E.-Peters. 
4. Siphlurus Linnaeanus Etn. 
5. Siphlurus aestivalis Eat. 
6. Siphlurus sp. 
7. Ametropus fragilis Alb. 
8. Metretopus norvegicus Etn. 
9. Ecdyurus hyalinus sp. nov. 
10. Heptagenia bipunctata sp. nov. 
Ametropus fragilis Alb. did not occur in the collection, but I hâve seen a single 
specimen from the Ural Government at the river Ular, collected by Mr. Basile Bostan- 
joglo, Moscow. 
The collection contained many specimens, both dried and in alcohol, and we see, that 
Baëtis vernus occurred frequeutly. It was interesting to find, in the rieh material of larvæ, 
üau. Фиа.-Ыаг. Отд. 1 
