39 54 Proceedings of the Royal Irish Academy. 



Female. — Length 742/*, breadth '384/j. Shape, a long oval, shoulders only 

 slightly marked. The fourth leg measures 691/t in length, process of the 

 trochanter (fig. 4o) large, the outer margin of this process is straight, 

 extremity pointed and slightly hooked, lower margin rounded, and there is 

 a blunt conical papilla at its inner corner where the process joins the 

 trochanter. Central foramen of the endogynium triangular, with a much 

 smaller triangular aperture appearing beneath the apex of the larger opening 

 (fig. 4£). Fixed chela with about six teeth, the third from the extremity 

 truncated, free chela with three distinct teeth, the proximal one being the 

 strongest (fig. 4c). The male was not found. 



Locality. — An ovigerous female of this form occurred amongst moss in 

 the Westport district in July. 



Gamasus ( Pergamasus i crassipes L. (PI. IV, fig. oa-c.) 



Clare Island, Achill Island, and in the Westport district, occurs commonly 

 in moss and under bark. 



At least two forms of this common species are found in Europe ; the type 

 form is very widely distributed, while the variety longicornis Berl. is found 

 in the north. 



In his monograph of the species of Gamasus Berlese figures (13, PI. viii, 

 fig. 9) the second leg of the type-form. I can only say that, compared with 

 this figure, the form, which presumably represents the type in Ireland, has 

 a somewhat different armature, at least as regards the large tibial process. I 

 have seen, however, an Italian male of this species obtained some years ago 

 from Dr. Berlese. This male, which was found at Florence, agrees closely 

 with my Irish specimens in the armature of the second legs. As it is 

 difficult to describe in words the exact shape of these processes, a figure of the 

 armature of the femur, patella, and tibia of one of these Irish specimens is 

 given (fig. 5a, b). 



The variety longicomvs Berl., is also common in the district. I have 

 specimens from Clare Island, Achill, Delphi, and the "Westport district. A 

 figure of the tibial armature of the second leg is given (fig. 5c). Dr. Tragardh 

 records its occurrence in French eaves (89, p. 523). 



Gamasus (Ologamasus) calcaratus C. L. Koch. 



The variety excisus, Berlese, occurred commonly in moss on Achill Island, 

 also on the seashore at Westport and Mulranny. Type form not definitely 

 determined. 



Distribution. — This and the two following species are no doubt widely 

 distributed in Europe. 



