39 58 Proceedings of the Royal Irish Academy. 



one is bifid at the extremity ; the free chela has a strong triangular tooth. 

 Palps small and weakly armed. 



The leg measurements are approximately ollju, 440/t, 451/1, and 605/<. 

 The last three pairs are stout, and the second pair is a little thicker than the 

 others. Armature consisting of short hairs and spines, many of the latter 

 spring from peduncles, and some are pectinated. The following are the more 

 important characteristics: — First pair, a row of three stout pedunculated 

 spines on the ventral side of the femur ; second pair, femur with a blunt 

 conical tooth ; beside this there is a sharp spine springing from a slightly 

 raised base, and there are two other spines on the lower side of the segment ; 

 third pair, a strong posteriorly directed spur on the femur ; fourth pair 

 without special armature, but there are two strong bristles on the femur. 

 The ambulacra fig. Id) are reduced to two pairs of appendages, as in 

 If. glabriusculus, but the upper lobes are longer ; the lateral lobes consist of 

 short triangular pieces ; the inferior lobe is reduced. In fact the ambulacra 

 are somewhat intermediate in structure between those of H. glabriusculus and 

 the typical gamasid. 



Female (fig. 7 b). Length 742/*, breadth 435^. Shape oval, relatively 

 broader than the male, hinder lateral margins with five or six pairs of bristles. 

 First dorsal shield large, finely punctured, hinder margin produced in a 

 rounded prominence ; second shield smaller and narrower, concave in front 

 and widely rounded behind. Sternal plate small and narrow, with the usual 

 hairs. The three pairs of triangular endopodial plates are widely separated 

 from the sternum, and send off long processes between the coxae. Genital 

 plate trapezoidal, as in the type species, anal plate large and of semicircular 

 form, the width is about 341 n (in H. glabriusculus it is smaller, measuring 

 only 165/n). Peritreme, capituluni, epistome and palps like those of the 

 male. Chelicerae straight, free chela with a group of three teeth set close 

 together at a little distance from the terminal tooth : fixed chela with a 

 large channelled tooth. Legs, with the exception of the second pair, a little 

 shorter than in the male, approximate length 506/i, 440^, 407/j, and 517/u 

 without the special armature of the male. 



Localities. — Under stones just below high-tide mark on the sea-shore at 

 \V r estport, in July. I have also found it commonly in a similar habitat at 

 Howth on the Dublin coast in September. 



Gamasolaelaps aurantiacus Berl. 



1879. ~< Seiu.s excisus L. Koch 35, p. 122. 1903. Cyrtolaelaps (?) auran- 

 tiacus Berlese 5, p. 241. 1904. Metaparasitus suboles Oudms. et Yoigts 75 

 p. 655. 1906. Berlese 13, p. 101. 



