Clare Island Survey — Acarinida. 39 109 



There seems to be no doubt that the genus Lentungula is synonymous with 

 the previously described genus Hyadesia notwithstanding the fact that the 

 latter was described from an immature form. The general structure, and 

 especially of the peculiar claw armature, puts this fact beyond doubt. Con- 

 sequently as R. uncinifcr Megnin is the type species the name of the family 

 (or sub-family if preferred) must be changed accordingly. 



Distribution. — H. fusca has been recorded from the coasts of the North 

 Sea (Heligoland), and the Baltic (Riigen, Kiel). 



Family TYROGLYPHIDAE. 



Glycyphagus domesticus de Geer. 



Tyroglyphus siro (Linn) Gervais. 



Tyroglyphus longior Gervais. 



Specimens of these three common and widely distributed species were 

 found in the Westport district. 



Tyroglyphus Wasmanni Moniez. 



A few specimens, in the hypopial nymph stage, were found on ants in a 

 nest of Formica fusca at Mulranny, Co. Mayo, in the month of September. 



As far as I can ascertain this is the first definite record of this ants' nest 

 mite from the British Isles. The specimens agree closely with Mr. Michael's 

 excellent description and figures of the hypopus of this species, except that 

 the shape is more regularly oval and the end of the body is not truncated ; 

 however, the slightest pressure would cause a change in the shape of this 

 delicately organized creature. There is also a pair of small suckers on the 

 first pair of epimera. 



With regard to the occurrence of this interesting species in Britain 

 Mr. Michael remarks : " I am not quite sure that it is found in Britain — I 

 have a strong impression that it is so " (51). As long ago as 1881 Mr. Parfit 

 found the early stages of an acarus on the abdomen and antennae of ants in a 

 nest near Exeter, in all probability this was referable to the present species, 

 which was not described until 1892 (Entoni. Mo. Mag. xviii, p. 43). 



Distribution. — In natural nests of Lasius fuliginosus in Holland, and in 

 artificial nests at Prague (Wasmann). 



Four additional species of Tyroglyphidae have been found in Ireland. 

 They are — 



Histiostoma rostro-serratwn Megnin. A few specimens found in company 

 with other tyroglyphid mites attacking decayed bulbs, Dublin, January. 



B.I.A. PKOC, VOL. XXXI. P 39 



