1 906-1907.] Scottish Hydrachnids. 393 



Yl\.— SCOTTISH HYDRA CHNIDS— SPECIES 

 COLLECTED DURING 1906. 



By Mr WM. WILLIAMSON. 

 {Read April 24, 1907.) 



The Hydrachnids recorded in the following list were collected 

 since my last communication to this Society. With the excep- 

 tion of Possil, none of the localities noted had been visited by 

 me previously for the purpose of collecting Hydrachnids. 



For convenience, the nomenclature followed is that of ' Hyd- 

 rachnidfe u. Halacaridae,' Piersig u. Lohman {Das Tierreich, 

 Lief 13), with the exception of Fiona discrcpans, Koen., as 

 Koenike's specific name must take precedence to that of Piersig. 



1. Genus EULAIS, Latr. 

 *Evlais miilleri, Koen. Wooden. 



2. Genus HYDRACHNA, Miill. 

 Uydrachna scutata, Pier. Faldonside. 



3. Genus DIPLODONTUS, Ant. Dug. 

 Diplodontus despiciens, Miill. Faldonside. 



4. Genus ARRHENURUS, Ant. Dug. 



*Atrkenu'rus globator, Miill. Wooden ; Faldonside. 



*Arrhenuriis sinuator, Miill. Faldonside. 



Arrhe7iurus caudatus, De Geer. Auchendinny. 



Arrhenurus, sp. (females). Hallyards ; Auchendinny ; Faldonside. 



5. Genus MIDEOPSIS, Neuman. 

 Mideopsis, a nymphal form found at Wooden. 



e. Genus LIMNESIA, C. L. Koch. 



Limnesia histrionica, Herm. Faldonside ; Otterstone. 

 *Li)nnesia tmdulata, Miill. Faldonside ; Possil. 

 Limnesia connata, Koen. Possil. 

 Limnesia maculata, Miill. Wooden ; Faldonside. 



Limnesia koenikei, Pier. Wooden ; Faldonside ; Possil ; Auchendinny ; 

 Lochwinnoch. 



7. Genus HYGROBATES, C. L. Koeh. 



Hygrohates longipalpis, Herm. Wooden ; Faldonside ; Auchendinny ; 

 Lochwinnoch (nymph). 



Species marked with an asterisk are new Scottish records. 

 VOL. V. 2 B 



