39 32 Proceedings of the Royal Irish Academy. 



the third leg only weakly thickened, with hut few bristles. The fourth and 

 fifth segments of the last pah- of legs are described as being furnished with 

 smooth bristles, and the sixth segment of the same pair is not much swollen. 



In the Clare Island specimens ( J ) the terminal segment of the third leg 

 is decidedly less thickened than in Piersig's figure (18, pi. xvii., fig. ±'3b) of 

 the typical form ; it seems to be slightly concave on the lower margin, and 

 there is a moderate number of hairs. At first sight the bristles on the fourth 

 and fifth segments of the last pair of legs appear to be smooth, but under a 

 high magnification a few of them are seen to be extremely finely pectinated 

 along one side. The terminal segment of the last pak of legs is of the usual 

 crozier shape, with a row of ten chitinous pegs on the moderately swollen 

 basal part ; an additional one is placed in the deep concavity, and there is 

 another at the end of the segment. 



I have taken this form in various localities in Ireland, where it is not 

 uncommon in pools on peat moors. 



Acercus Pionopsisi lutescens (Herm.). 

 Ballyuahinch Lake, Connemara, June. 



Forelia 'Tiphys i liliacea (0. F. Mull ). 

 Lough C'ahasy near Louisburgh. 



The females occurred commonly in this locality in July ; the male appears 

 to be much rarer. 



Sub-fam. Atukixae. 

 Aturus scaber Kramer. 



Streams on Croaghpatrick ; Carrownisky River ; stream flowing from 

 Lugaloughaun, June and July. 



Aturus runcinatus (Sig. Thor). 



Streams on Croaghpatrick, June and July. 



Some of the females from these localities contain a single elliptical egg of 

 huge size in comparison with the mite; one of these eggs measures -lo-i 

 by "110 mm. 



Common amongst aquatic mosses growing on stones in company with the 

 preceding species. They are probably the most abundant of all of the 

 stenothermal forms occurring in Irish streams. 



Brachypoda versicolor (0. F. Hull.). 

 Westport River ; C'ahasy Lough near Louisburgh. 



