Glare Island Survey — Acarinida. 39 93 



this respect, from the figure of the female in Berlese's "Acari Mirmecofili " 

 (12, pi. viii, f. 20). The measurements of the male are 495yu x 407/x, and 

 of the female 517/u x 429^. 



Distribution. — Italy (Portici, Silvestri) ; France (Beauvais, Janet, in nest 

 of Lasius mixtus) ; England (Weybridge, in nests of Lasius umbratus, 

 Donisthorpe). 



Urotrachytes formicarius (Lubbock). 



This beautiful species is the only one of the large, red, ants' nest mites 

 found in the district. It is common both on Clare Island and at Westport 

 in nests of the yellow ant Zasius flavus. 



The male occurred in some of the nests. It is slightly smaller than the 

 female, the length varying from 844^ to 947/x- The circular genital aperture 

 is situated, in most specimens, opposite the third and fourth coxae, in others 

 it is exactly opposite the third pair. Each chela of the mandibles is armed 

 with a single strong tooth. Immature examples in the second nymphal stage 

 were also found. This stage measures 768^ in length, and very closely 

 resembles that of Trachyuropoda laminosa, figured by Berlese (12, pi. xi, 

 fig. 63), with a raised central ridge and three pairs of large depressions on 

 the dorsum. The ventral surface is also very similar in the two species. 



Distribution. — France (Luxemburg, Wasmann) ; England (Cornwall, 

 Michael ; Isle of Wight, Boxhill, Bradgate Park, Forth Bridge, and other 

 localities, Donisthorpe in " Entom. llecord," xxii, xxiii). Berlese remarks 

 that he has not found this species in Italy. 



Trachyuropoda coccinea (Michael). 



This species occurs commonly in nests of the ant Formica fusca in the 

 eastern parts of Ireland, as at Scalp, Powerscourt, Glendalough, and Howth, 

 yet I could find no trace of it in the Clare Island district. 



The variety sinuata Berlese, lives in nest of the same ant at Glendalough, 

 and no doubt in many other localities. 



Trachyuropoda lamellosa (Can. et Berl.). 



1877. Trachynotus troguloides Can. et Fanzago 25, p. 62. 1884. Uropoda 

 laminosa Can. et Berl. " Atti. Soc. Ven. Trent," ix, p. 6. 1884. Uropoda 

 lamellosa Berl. 1, Fasc. xiii, n. 1. 1894. Glyphopsis lamellosa Michael 

 49, p. 309. 1904. T. laminosa Berl. 12, p. 360. T. celtica Halbt. 31, 



Tallaght, County Dublin, many females and a few males found in nest 

 of the ant Lasius niger on the bank of the Dodder in April ; has also occurred 

 with Lasius flavus, on Lambay Island. 



K.I.A. proc, vol. xxxi. N 39 



