L900.1 HalbkrT. — A Nciv Water Mite from Ulster. 



95 



Arrenurus Kanel, sp. nov. 

 Mai.e (Figs. T, 2, 3). — Length, including appendage, 1-2 mm., 

 breadth, 088 mm. Colour yellow, tinged in places with green 

 and with reddish-brown blotches. Legs and epimera pale green. 

 Body oval, very gradually narrowed in its posterior half, thence 

 suddenly contracted and produced into a well-defined appendage (length 

 0-22 mm., breadth at base o 32 mm.) The '' impressed line " 

 encloses a considerable portion of the dorsal surface, is widely rounded 

 in front, bent outwards in the middle, and terminates on the side of the 

 appendage. On the back is a double row of circular depressions, and 

 near these, springing from small papillie, are a few long hairs. The body 

 of the animal, as well as being coarsely granulated, shows a very distinct 

 longitudinal striation. The posterior end of the main appendage is 

 furnished on each side with several pairs of hairs, the arrangement of 



Fig. I. 



Fig, 2, 



Fig> I, Arrenurus Kanei, sp. nov., Male, dorsal view without legs or 

 palps. Fig. 2, Male, lateral view. Magnified. 



which can be best seen in Figure i. The male genitalia are remarkably 

 complex, from the end of the main appendage projects a trilobed trans- 

 parent appendage"" (length 004 mm.) — the " hyalines hautchen" of German 

 writers— close to this on each side is a small outwardly-cui-ved horn. Below 

 the processes just described lies the comparatively long petiolus (length 

 Q-iS mm.) which is cylindrical, somewhat widened about the middle, and 

 bent upwards at the apex. This is again enclosed by two transparent 

 club-shaped organs, which meet just beyond and beneath the free end of 

 the petiolus. As in the case of the latter these spring from the ventral 

 surface of the main appendage. Epimeral plates very large, together 

 with the genital area occupying most of the under side of the body. The 

 legs and palpi are of the normal type, the former being rather long and 

 robust, the fourth segment of the last pair carr3dug a curved spur at the 



apex. 



* In the Lough Erne specimen this appendage is decidedly longer than 

 in the Monaghan example, 



A4 



