neio and obscure British Spiders. 395 



Genus Decymbium. 

 Decymhium tibiahj Blk. 



Two adult males and a female of this very distinct species 

 were taken by myself amongst dead leaves in the woods at 

 Wreay, near Carlisle, in April 1891. 



They are very similar to D. {Neriene) niqrum^ Blk., but 

 the stout, gouty, tibiae of the first two pair of legs render them 

 easy to recognize in the male sex. 



Genus Tkoxochrus. 

 Troxochrus cirrifrons^ Cb. 



An adult male of this apparently very distinct little species 

 occurred near Carlisle in 1890. 



M. Simon considers it to be merely a variety of T. scahri- 

 cidus, Cb. ; but unless an examination of a much larger 

 number seems to give evidence of a gradation of the distin- 

 guishing characters, one would be inclined to consider it as a 

 distinct species. 



Genus Areoncus. 

 Areoncus vaporarioram, Cb. 



A single immature male, which I feel pretty confident 

 belongs to this species, was taken by myself in a cellar at 

 Cannock, Staffordshire^ in June 1891. 



Epeirida. 



ZiUa x-notata, Clerck. (PL XXI. figs. 8, a, h.) 



Zilla atrica, C. K. (PI. XX. fig. 3 j PI. XXI. fig. 9, a.) 



The very common x-notata can be very easily distinguished 

 from " atrica " (which is scarcely less common) in the male 

 sex by the comparative shortness of the palpi {vide PI. XXI. 

 figs. 8, 9, a). The distinctions by which in the female sex 

 these two species may be recognized are less easily observ- 

 able. 



In the first species the epigynal area appears as a 

 narrow, transverse, black plate ; while under a higher power 

 it resolves itself into tlie form shown on PI. XXI. fig. 8, h. 



The same portion of structure in '' atrica " exhibits under 

 a low power a similar appearance, but at its apex can easily 

 be observed a cordiform dull white prominence (PI. XXI. 

 fig. 3). 



27* 



