Clare Island Survey — Acarinida. 39 37 



generally (2). On the other hand, although the species is very distinct and 

 easily recognized, it would appear to be rare on the continent of Europe. The 

 only extra-British record that I know of is a recent one from Switzerland 

 (Walter, 32]. 



Arrhenurus cuspidifer Piersig. 



Lough Baun, Louisburgh, July. 



Not uncommon, amongst a growth of Chara. 



Arrhenurus tricuspidator (0. F. Miill.). 



Achill Island, June. 



The colour of the specimens from this localit3 r is a dark reddish-brown ; 

 the bright red form is rather rare in Ireland. The mite recorded here is the 

 A. bicuspidator of (12) and other references. 



Arrhenurus Neumani Piersig. 



Achill Island in lakes and bog-pools, June ; Glendalough Lake, Connemara, 

 September. 



This species is very characteristic of the lakes and peat-moors of the west. 

 I have not yet found it in the eastern parts of Ireland. 



Distribution. — Widely spread in Europe, ranging from Finland to Italy. 



Arrhenurus claviger Koenike. 

 Lough Cahasy, Louisburgh. 



Arrhenurus crassicaudatus Kramer. 

 Prospect Lough, Belclare ; Loughs Cahasy and Baun near Louisburgh. 



[In the lowland part of Galway, outside the limits of the district dealt 

 with in the present paper, I have found three additional species of Arrhenurus. 

 These are : — 



Arrhenurus Stecki Koenike. — In a sphagnum-pool near Ross Lake. 

 September. 



Arrhenurus crenatus Koenike. — River Corrib. In a small deep lake on 

 the limestone at Ballindooley, near Galway, a beautiful bright red form of this 

 species occurs, which is strikingly different from the dull purplish form found 

 in the Royal Canal and other places in the east of Ireland. 



Arrhenurus albatur (0. F. Miill.). — Lakes at Moycullen.]. 



With the exception of some slight changes in the arrangement of the 

 genera and species, the classification made use of in the foregoing list is that 



