Glare Island Survey — Acarinida. 39 33 



Sub-fam. Mideopsinae. 



Midea orbiculata (0. F. Miill). 



Crott Lough near Belclare, Co. Mayo. 



Mideopsis orbicularis (0. F. Miill.). 



Oweuwee River at Belclare ; Lakes near Westport ; Prospect Loughs at 

 Belclare. 



Sub-fam. Arrhenurinae. 

 Arrhenurus securiformis Piersig. 

 Clare Island, Lough Avullin, June. 



"Widely spread in Ireland, though rather rare and usually met with singly 

 as far as the male is concerned. No doubt both this and the following species 

 escaped observation on the adjacent mainland. 



Arrhenurus cylindratus Piersig. 

 Clare Island, Lough Avullin, June. 



Arrhenurus globator (0. F. Miill.). 

 Lough Baun, Louisburgh. 



Arrhenurus Kanei Halbt. (Plate III., fig. 26 a-d.) 



A female example of this species occurred in a small peaty lake in the 

 north-east of Achill Island, in the month of June. 



Arrhenurus Kanei would seem to be a rare lake-frequenting species ; it 

 was described from a few specimens discovered by Mr. W. F. de V. Kane in 

 the north of Ireland (4). The species is closely allied to a Swedish mite, 

 Arrhenurus nobilis, described by Neuman in his well-known monograph on 

 Swedish Hydracarina (17) ; and it is a question whether the Irish mite should 

 not be referred to a variety of that species. If Neuman's description and 

 figures of A. nobilis are correct — and judging by their excellence in other cases 

 there is no reason to doubt this — certain differences are apparent between the 

 two forms. Arrhenurus nobilis has not been found since Neuman's time, and 

 unfortunately the single type-specimen 1 is missing from his collection of water- 

 mites now preserved in the Gottenburg Museum (Piersig, 19). 



The following is a translation of the Swedish description of Arrhenurus 

 nobilis, for which I am indebted to my friend, D. Freeman, m.a. The modern 

 names of the structures referred to are inserted in square brackets : — 



" Male : The body is oval, rounded anteriorly, posteriorly prolonged to a 

 long and broad appendage, which at the end is roughly rounded off, and in 



1 " I obtained only one example in October, 1SG8, at Malaren, near Kungsharun, at a depth of 

 from 20 to 30 feet" (17, p. 92). 



B.I. A. PROC, VOL. XXXI. E 39 



