130 ON NEW AND RARE BRITISH ARACHNIDS. 



Porrhomma Thorellii, Herm. PI. A. figs. 17, 18. 



Porrhomma Thorellii, Herm. 



A. R. Jackson Trans. Not- 



tingham Naturalists' Society, 191112, p. 36, 

 pi. II., figs. 22 and 27. 



Average length, about 2'4mm. This species, differen- 

 tiated by Dr. Jackson (I.e. supra) from others with which 

 it has been mixed up, is allied nearly to Porrhomma 

 pygmceum, Blackw., and has not, until Dr. Jackson's 

 announcement (supra) been before recorded as British. 

 Both sexes are recorded. The example from which my 

 figures were drawn was sent to me in 1902 by Mr. W. 

 Falconer, from Huddersfield, and was then doubtfully 

 named by me, P. pygmo2um, Bl. 



Porrhomma pallidum, Jackson. 



Porrhomma pallidum, A. R. Jackson ; Trans. 

 Nottingham Naturalists' Society, 1911 12, 

 p. 38, pi. II., figs. 18, 32. 



Length l*65mm. I'Smm. This appears to be, so far 

 as at present known, a Northern form only. Dr. Jackson 

 reports it as hailing from Moray, in N. Scotland, and 

 mountains in Cumberland ; also Northumberland, York- 

 shire, Cheshire, and Staffordshire, where it seems to be 

 not rare in both sexes ; found amongst moss and dead 

 leaves in woods. I have not myself seen a type of this 

 species. 



Porrhomma montanum, Jackson. 



Porrhomma montanum, A. R. Jackson ; Trans. 

 Nottingham Naturalists' Society, 1911 12, 

 p. 40, pi. II., figs. 24 and 34. 



Length, 1-5 2m. This spider, new to science and 

 to the British List, is also a Northern form, and usually 

 found at high altitudes Ben Voirlich, Scotland, 

 Cumberland, Isle of Man, Northumberland, Yorkshire, 



