Clare Island Survey — Acarinich. 39 29 



•02 mm. The second segment is strongly convex, and the ventral surface is 

 produced in a prominent rounded knob. Fourth segment suddenly swollen 

 outwards at the middle of the under side, and at the distal end of the evenly 

 rounded hump thus formed is placed a forwardly directed hair. 



Distribution.- — The known range is Germany, Switzerland, and Ireland ; 

 this being the first British record of the genus Feltria. 



Feltria circularis Piersig. 



Found in the same locality as the preceding species. 

 Occurs also in streams on the Dublin Mountains. 



Sub-fam. Pioninae. 



Piona nodata (0. F. Mull.). 



Lakes in the north-east of Achill Island ; Lough Cahasy near Louisburgh. 

 The brightly coloured form figured by Piersig (18, pi. xi., 30J) occurred in 

 the latter locality. 



Piona longipalpis (Krendowsky). 



Clare Island (Lough Avullin) ; lakes at Castlehar, Westport, Belclare, and 

 Louisburgh. 



A fine bright red form of this mite is not uncommon in lakes in west and 

 central Ireland. 



Piona stjbrdalensis (Sig. Thor). 



Loughs Baun and Cahasy, near Louisburgh. 



Occurred abundantly in these lakes in July; a few specimens of the nymph 

 were also found, the genital area of which greatly resembles that of the 

 common Piona nodata (0. F. Mull.). 



Distribution. — Scandinavia (Thor) ; Switzerland (Walter, 34) ; Great 

 Britain (Norfolk Broads, Soar); Ireland (7). 



Piona carnea C. L. Koch. 



Clare Island ; Achill ; lakes at Westport, Belclare, and Louisburgh. 

 Common, especially in lakes on peaty ground. 



Piona circularis (Piersig). 

 Clare Island, Lough Avullin, June. 



Piona discrepans (Koenike). 

 Lough Nainucka near Louisburgh. 



