392 CD. SOAR ON A LIST OF FRESH- WATER 



and that is in connection with the naming of the single species of 

 Eylais here recorded. The species of this genus are very difficult 

 to identify, the great point of recognition according to Piersig's 

 key being the form of the eye-plates. Now, I find these eye- 

 plates to vary more or less in every specimen I have examined, 

 and I am at present in correspondence with Dr. Piersig on the 

 subject. I do not think there is any doubt, however, that the 

 species found by Mr. Taverner (No. 38 in the list) is any other 

 than Eylais soari, Piersig. 



HYDKACHNID^. 

 Sub-family : HYGROBATiNiE. 



Genus i. Atax. 



1. Atax crassipes. MuUer. Common. 



Genus it. Curvipes. 



2. Curvipes longipalpis. Krendowsky. 



Genus hi. Acercus. 



10. Acercus ligulifer. Piersig. This is the first time thifj 



species has been found in Britain. 



Genus iv. Wettina. 



11. Wettina maeroplica. Piersig. 



Genus v. Atractides. 



12. Atractides spinipes. Koch. Only two specimens taken. 



Genus vi. Hygrobates. 



13. Hygrobates longipalpis. Hermann. 



14. ,, reticulatus. Kramer. 



15. ,, nigro-maculatus. Lebert. 



