39 116 Proceedings of the Royal Irish Academy. 



It is a robustly built species ranging from 2,200/a to 2,380// in length, and 

 the breadth is about 1,300/*. The cephalothorax is sharply pointed in front 

 and, in most specimens, there is but little demarcation from the abdomen. 

 Thor describes the crista as follows : — " The crista lies in the centre of an 

 oblong, thinnish, chitinized plate (something as in the case of B. vertex 

 Kramer). The actual linear-shaped crista widens posteriorly in a diamond 

 or circular shape with two hair pores and extends anteriorly into the promi- 

 nent chitinized edge where there are from 7 to 9 smaller hairs and behind 

 these at the edge of the crista the usual two large hair pores." 



Rhyneholophus tardus sp. nov. (PI. VIII, fig. oia-d). 



The following is a short description of a slender-legged Ehyncholophus 

 which was found under stones on the sea-shore at the head of Bellacragher 

 Bay, near Mulranny, in September. It does not appear to have been 

 previously described. 



The shape of this mite (fig. 34a) is long oval, rounded at both extremities ; 

 the length, including apex of crista, is about 1,638/*, breadth 844/*. Colour 

 orange red. There is only a sparse covering of hairs ; on the anterior parts 

 of the body these are short and curved, on the posterior margin they are 

 more closely set, longer, and all are minutely spinous (fig. 34b). The cephalo- 

 thorax is indistinctly marked off from the abdomen by a slightly convex 

 groove. Eyes minute, consisting of a single lens on each side. The crista 

 (fig. 34c) is a slender rod in the centre of a very thin chitinous plate ; distal 

 sensory area of the usual triangular shape, sharply pointed, with two long 

 sensory hairs, and immediately in front of these is 'a single, forwardly directed 

 hair which reaches a little beyond the anterior end of the body. Proximal 

 sensory area as usual in the genus. The legs are slender and rather weakly 

 developed ; the first pair are considerably shorter than the body, with elongate 

 tarsi (length 195/*, breadth 65/i), which are but little swollen on their dorsal 

 margin somewhat resembling Thrombidium in that respect ; the lengths of 

 the four pairs are approximately as follows : — 1078//, 594/*, 650/i, S91/*. The 

 shape of the rostrum and palps is shown in dorsal view (fig. Sid). 



Ehyncholophus sabulosus sp. nov. (PI. VIII, fig. 35a, b.) 



The following are some comparative notes on a small species of Ehyncho- 

 lophus which was found not uncommonly on the Mulranny sandhills, County 

 Mayo, during the month of September. It is a noticeable species duiing 

 life on account of its bright red colour. 



The general structure closely resembles that of the preceding species 

 (R. tardus). Shape oval, rather elongate (fig. 35a). Size smaller. Length, 



