39 I'fi Proceedings of the Royal Irish Academy. 



Both this and the following species are common in lakes throughout the 

 district, though they were not found on Clare Island. 



Limnesia maculata CO. F. Mull ). 

 In the same localities as the preceding species. 



Limnesia undulata CO. F. MiilL). 



Glendalough Lake, Connemara, September. Not found in the immediate 

 district of Clare Island. 



Limnesia Koenikei Piersig. 

 In rivers at TVestport, Belclare, and Louisburgh. 



Sub-fam. Atractidkae. 



Until the appearance of Dr. Koenike's paper (11) on Atractides 1 the 

 species of this genus had not been critically examined by aearologists, and it 

 was generally assumed that only one well-marked form was found in Europe. 2 

 In that paper he describes three new species: and Dr. Maglio has since 

 characterized a fifth species from Italy (16). In the present paper a descrip- 

 tion is given of a sixth species found in the Clare Island district and elsewhere 

 in Ireland. 



Atractides brevirostris nov. sp. (Plate II., fig. 13 a-e). 



This species may be compared with A. anomalus Piersig, which it resembles 

 in the arrangement of the ehitinous plates of the dorsal surface, where the 

 frontal shield is not enclosed by the large dorsal plate. 



The colour is rather dark yellowish brown : the eye region and parts of the 

 epimera are tinged with carmine, legs yellow. The body is larger, less ovate, 

 and the front margin is not concave in the female, as it is in A. anomalus. The 

 chief differences between the two forms will be more readily seen in tabular 

 form. 



• Torrenticola of authors. 



- Under the name of Busetria spinirostris, Sig. Thor has described an Atractides from Norway. 

 It is difficult to say if this represents a distinct form. In the " Tierreich" it is referred to by Piersig 

 as a doubtful species (18). 



