Clare Island Survey — Acarinida. 39 31 



the species. The long spine at the apex of the third pair of legs is armed at 

 the base with two strongly curved processes, and the chitinous peg at the end 

 of the fourth palp segment is strongly developed. The third and fourth pairs 

 of epimera are very large and resemble those of P. rufa, except that their 

 inner margins are much wider apart than they are in that species. 



In the female the chitinous genital plates are very feebly developed, rarely 

 uniting more than about five discs in one piece. The number of discs in the 

 Irish specimens varies from eight to twelve on each side. (PL III., fig. 34) 



Distribution. — The records of this species are few — Scandinavia (Thor) ; 

 Gotland (Walter, 35) ; Germany (Koenike and Thienemann, 14); Turkestan 

 (Thor) ; England (Lincolnshire, George) ; Scotland (Edinburgh, Eannoch, 

 Lydoch, Williamson) ; Ireland. 



Piona conglobata C. L. Koch. 



Lakes in the Louisburgh district. 



A few specimens taken in the Carrownisky River in the above locality are 

 apparently to be referred to the variety ccmjugula Koenike. This variety may 

 be recognized by the absence of the small peg which in the typical form is 

 present at the base of the tooth on the inner side of the fourth segment. 



Hydrochoreutes ungulatus (0. L. Koch). 

 Glendalough Lake, Connemara, September. 



Hydrochoreutes Krameri Piersig. 



Clare Island ; Carrownisky River and Cahasy Lough near Louisburgh. 

 Much commoner than the preceding species in the Clare Island district, 

 while the reverse is true of the East of Ireland. 



Wettina podagrica (C. L. Koch). 



One specimen found in the Westport River, June. 

 This is the first record of the species from Irish waters. 

 Distribution. — Norway (Thor) ; Switzerland (Walter) ; Germany (Piersig) ; 

 Italy (Maglio) ; England and Scotland (Oban, Soar) ; Ireland. 



Pionacercus Leuckarti Piersig. 



Clare Ireland, in bog pools, June. 



The specimens ( <? , 2 ) from this locality should perhaps be referred to the 

 variety sc.utatus Sig. Thor, though they differ somewhat from the description 

 of that form. The male of scutatus is said to have the terminal segment of 



