Clare Island Survey — Acarinidu. 39 19 



5. Shape of the body elliptical, only slightly narrowed in front ; frontal 



setae very long ; anterior side corners of the large dorsal plate 

 blunt, . . . . . A. ellipticus Maglio. 1 



6. Shape ovate, strongly narrowed in front ; anterior corners of dorsal 



shield angled, . . . . . .7 



7. Eostrurn long and slender ; capitulum narrower ; wedge end of 



the first pair of epimera 2 removed a short distance from the 

 genital area; front margin of the body strongly concave; legs 

 more slender. Male with the second and third pairs of epimera 

 much longer, and the genital area placed further back, 



A, anomalies C. L. Koch. 



8. Eostrurn decidedly shorter and stouter; capitulum broader; 



wedge-end of first pair of epimera approaching closer to the 

 genital area; front margin straight between the eyes; legs 

 longer with thickened terminal segments. Male with the 

 second and third pairs of epimera shorter and broader ; 

 genital area placed further forward, . A. brevirostris n. sp. 



Sub-fam. Hygrobatinae. 



Hygrobates longipalpis (Hermann). 



Achill ; Westport ; Louisburgh, &c. Common throughout the district, but 

 it was not found in Clare Island. 



Hygrobates naicus Johnson {reticulatus Kramer). 



Clare Island, stream from Lough Avullin ; Westport ; Carrownisky Eiver, 

 Lugaloughaun, and other lakes near Louisburgh. 



Hygrobates calliger Piersig. 



Found in the Bunowen Eiver near Louisburgh. 

 This is a stenothermal form occurring in rapidly flowing water. It is 

 common in mountain streams in county Wicklow. The nymph of this species 



1 I have found the males of this elegant species amongst mosses growing on submerged stones in 

 the River Dodder at Friarstown. county Dublin, in July ; aud the female has occurred in the River 

 Flesk, near Killarney. The species may be easily recognized by its peculiar elliptical shape, which 

 is quite different from the remaining species of the genus. The known range is Germany and Italy. 

 This is the first record for the British Isles. 



2 The female of A. anomahis C. L. Koch has been described and figured showing the wedge- 

 shaped end of the first epimera reaching the genital area. In the Irish examples, however, there is 

 always a short intervening space. 



02 



