*5 8 7"he Irish Naturalist [July, 



Llmnesia hlstrlonlca, Hemiaiin.— The coinmou inite placed under 

 , this uame requires investigation. Male (?) examples seem to be 



disproportionately numerous. 

 Llmnesia maculata (Midler), Bruzelius.— Common. 

 Brachy porta versicolor, O- F. Midler.— This very small mite is much 



the commonest of the Hydrachnida about Dublin. 



lYlirteopsIs orbicularis, O. F. Midler.— Royal Canal. Rare. A single 



example was taken on two occasions in May. 

 lYlidea elliptica, O. F. Midler.— Royal Canal, occasionally. 



Arrenurus globator, O. F. Midler.— Generally distributed, and fairly 



common. 

 Arrenurus securiformis, Piersig.— Many examples $ occurred in 



a ditch near the new Clontarf railway station (May and June). 



Arrenurus caudatus, De Geer. — Examples $ and 9 , brilliantly 

 coloured as in Neuman's figures (orange-red anteriorly and 

 posteriorly, aud indigo-blue in the middle of the body) were taken 

 plentifully from a ditch by the railway at Broom Bridge, Royal 

 Canal. 



Diplodontus despiciens, Midler. — The dusky yellowish-brown mite 

 figured and described by Neumau under the synonym D. filipcs 

 Duges, is rare here. I found it only in the Tolka River (Botanic 

 Gardens), August, and a few years ago at Carton, Maynooth (June). 

 A bright red-bodied form with red epimera, legs, and palpi is com- 

 mon ; the body is not depressed and somewhat flaccid as in Neuman's 

 mite, and it is a livelier and stronger swimmer. Is there a specific 

 distinction ? 



Hydryphantes ruber, De Geer.— A few examples in a marsh pool, 

 llowth Hill, in May. This Hydrachuid is one of the first to appear 

 in the season ; it has been detected by Mr. Halbert this year in the 

 middle of March. 



Tnyas venusta C. L,. Koch. ?— One example found in a pool inSantry 

 Demesne. 



Hydrachna giobosa (De Geer), Duges.— Plentiful in the ponds at 

 Mount Temple, Clontarf, in May. 



Hydrachna Sp. — A mite of this genus having the plates of the area 

 genitalis widely distant from each other, occurred a few times in 

 the Royal Canal (March). Mr. Halbert secured many examples this 

 year (March) at Gollierstown, by the Grand Canal. I have not seen 

 it figured or described ; Piersig's descriptions of the genus have not 

 yet appeared. Neuman points out the separation of the genital 

 plates in his description of immature examples of H. geographka,\*\\\z\\ 

 however, is much the largest of the Hydnuhniihc, attaining eight 

 or nine millimetres in length of body, while this species barely, 

 reaches two. 



Eylais extendens (Midler), Latreille.— Common, April to July. 



Llmnochares holoserlcea, De Geer.— Rather common, March to 

 June. 



