Clare Island Survey — Acarinida. 39 91 



male in general structure. Genital plate very large, of a regular oval shape, 

 except at the truncated hinder margin, surface coarsely punctured Trito- 

 sternum with crown-shaped basal piece, stem with a branch on each side, 

 close to the base, extremity branched. The hairs of the maxillary plate are 

 more slender. Palps as in the male except for the absence of the peculiar 

 araiature on the inner side of the third segment, in place of which there is 

 a single small spine. 



The chief points in which the present species differs from the preceding, 

 apart from size, are the longer marginal plates, the coarse puncturing of the 

 epidermis, the presence of modified hairs on the side margins of the body, 

 and, especially in the male armature of the third palp segment. 



Localities. — Westport, under stones on the sea-shore, nymphs and adults 

 in July, and in a similar habitat at Mulranny, Co. Mayo, in September. 

 Nymphs and adult males were also obtained from debris collected from old 

 nests of Black-backed Gulls, and Puffins, on The Bills Rocks in June. I have 

 also found it in company with the preceding species on the coast of county 

 Dublin at Dollymount and Howth. 



Uropoda obscura (C. L. Koch) Berl. 

 I have found the immature (nymphal) stage of this mite amongst moss 

 at Tibradden, Dublin mountains, in the month of June. 



Uropoda tecta Kramer. 



Occurs in fungi in woods at Glendalough, county Wicklow, September. 

 Uroobovella notabilis Berl. 



Found commonly in a nest of the ant Formica fusca in a decayed birch 

 log at Glendalough in September; also at the Scalp and Powerscourt in 

 county Wicklow. 



The specimens are a little shorter and broader than those described by 

 Berlese (12, p. 338), the largest measures about 717/x in length, by 588/i in 

 breadth. This species does not appear in Mr. Donisthorpe's records of 

 British myrmecophilous mites. 



Urodinychus ovalis (C. L. Koch), var. Thorianus Berl. 



Adult males and females of this fine species were found under bark in the 

 Westport demesne in July. They are of a reddish-brown colour ; one of the 

 examples measures 896^ in lengtb, therefore a shade smaller than the type. 

 It is possible that the large specimens (950,u), recorded from Holland by 

 Oudemans (74, p. 46), may be referable to this variety. 



Distribution. — Described by Berlese (6, p. 271) from specimens collected 

 in Norway by Dr. Thor, 



