92 NEW AND RARE SPIDERS. 



GEN : PORRHOMMA (Sim., Neriene Bl., ad partem.) 



PORRHOMMA NIGRUM. 



Tmeticus niger Rev. F. 0. P. Cambridge. Ann. and Mag. N.H., 

 1891, ser. and vol. vii., p. 80, pi. ii., fig. iv. 



Examples of this fine species, new to science, were found by Rev. 

 F. 0. P. Cambridge, under stones on the top of Helvellyn, in 

 September, 1890. It is closely allied to PorrJwmma montigena 

 (C. Koch), but is, I think, distinct. The minute description given 

 by my nephew (I.e. supra), and his exceedingly accurate figures 

 leave little to be desired, excepting that the form of the sternum 

 (which is the leading character in the genus Porrlwmma Sim.), 

 does not terminate behind " in a broad truncate prolongation," but 

 in a rather sharp conical point. This point, however, bends 

 upwards towards the pedicle, which unites the thorax and abdomen, 

 and might easily be overlooked. 



GEN : OPISTOXYS (Sim., Neriene Bl., ad partem.) 

 OPISTOXYS SUBACUTA, sp. n., fig. 3. 



Adult male, length If lines. 



The whole of the anterior part of this spider is yellow, the femora 

 and tibiae of the legs tinged with orange. The profile of the caput 

 and thorax forms a slight curve with a very small depression just 

 behind the occiput. The cephalothorax is glossy, and appears 

 to be destitute of hairs. The height of the clypeus equals half 

 that of the facial space. 



The Eyes are small and rather closely grouped together in two 

 nearly concentric curved rows, all are pearl-white, excepting the 

 fore-centrals which are dark, they are seated on black spots, the two 

 lateral pairs on tubercles, and the eyes of each of these two pairs 

 are contiguous to each other. The eyes of the fore-central pair are 

 smallest and contiguous to each other, and each is separated from 

 the hind-central eye nearest to it by a diameter's interval. The 

 eyes of the hind-central pair are slightly nearer together than each 

 is to its adjacent lateral eye, the interval being rather less than a 

 diameter. The four central eyes form a small trapezoid, whose 

 anterior side is shortest, and its posterior side longest. 



