39 52 Proceedings of the Royal Irish Academy. 



Mukanny, in rotten wood, September. Has also been found on Lambay 

 Island in November. 



Distribution. — Norway ; Holland. 



A form of G. runciger found amongst decayed wood at Mulranny, county 

 Mayo, in all probability represents a variety of that species. It is of about 

 the same size (length 819^). and differs in the armature and smaller size of 

 the second legs (fig. 2e). Compared with the type the femoral spur is longer 

 and more slender, and there is no trace of a protuberance at its base ; the 

 axillary process is comparatively long and knife-shaped, resembling that of 

 G. runcatellus. The process of the patella is more decidedly cone-shaped ; 

 the process of the tibia is also larger. The last pair of legs measures about 

 768^ in length; the lower outline of the trochanter (fig;. 2/) is interrupted 

 by a small process. The chelicerae (fig. 2g) greatly resemble those of the 

 type-form, as figured by Berlese, but the two teeth on the fixed chela are 

 not so distinct. As this is possibly a permanent form of G. runciger I propose 

 for it the varietal name armatus. 



Gamasus (Pergamasus) parvulus Berl. 

 A male of the type-form has been found at Lucan, county Dublin ; and I 

 have also found an adult male of the variety dilatatellus Berl., in rotten wood, 

 at Glendalough during September. This variety is recorded by Berlese from 

 the Apennines. 



Gamasus (Pergamasus) robustus Oudms. 



Clare Island, adult males taken in March, June, and July. Achill 

 Island, adults and nymphs, in moss and under fallen pine-needles, September. 

 The Bills, male and female, June. Westport, Knappagh Wood, in moss, 

 August. 



Apparently common in the district. It is a very distinct species, remark- 

 able for the strong armature of the second legs in the male. Originally 

 described as a variety of Gamasus longulus, its specific distinctness was 

 recognized later, both by Oudemans (65, p. 82) and Berlese (13, p. 219). 



Distribution. — Norway and Swedish Lapland, Germany, Holland, Britain. 

 I have seen specimens taken at Barmouth, in Wales, by Mr. C. D. Soar. 



Gamasxts (Pergamasus) alpestris Berl. 

 A fine male example of this species was found amongst moss, at Lucan, 

 in February. 



Gamasus (Pergamasus) diversus sp. nov. (PI. IV, fig. 3a-e.) 



This species has the usual characters of the sub-genus Pergamasus, so 

 that it is unnecessary to give a detailed description of the entire animal. It 



