ON BRITISH ARACHNIDA. 57 



at all of the form " cirrifrons " !) On the whole T. 

 cirri frons still seems to me to be a distinct species from T. 

 scdbriculus. Not only do Mr. Falconer's females differ 

 from what I believe to be the true female of scabriculus 

 and with Bosenberg's figure, but they also agree exactly 

 with others, in my collection, mixed up hitherto 

 with those which I consider to be of that sex of T. 

 scabriculus : indeed, out of eleven females thus mixed, 

 I found six of the form I believe to be scabriculus, and 

 five of cirrifrons. Of the circumstances and localities, 

 however, of these, I have no special notes ; all having 

 hitherto been considered to be scabriculus. With a view 

 towards clearing up the question whether a female 

 distinct from the normal form of that of scabriculus can 

 be reasonably allotted to cirri/rons I have given (pi. A. 

 figs. 18, 19) a figure of the epigyne of each of the forms 

 mentioned above. 



Evansia merens, Cambr. 



A male and female were found in ants' nests, and sent 

 to me in May, 1909. by Mr. H. Donisthorpe from Nethy 

 Bridge, Aberdeenshire. Both sexes of this species 

 were also found by the Rev. J. E. Hull in the nests of 

 an ant (Lasius niger) and sent to me from Northumber- 

 land. An adult female of this species was also taken by 

 Mr. Hull in a situation far removed from any nests of 

 ants, so that it seems probable that the species is not 

 invariably dependent for its perpetuation on obtaining 

 the hospitality of the ants. I have myself found this 

 to be the case in respect to another ants'-nest species, 

 Thyreosthenius biovatus, Cambr. 



Gen. Nov. EBORIA, Falconer. 



This new genus is based on a rather obscure spider 

 found in 1909 by Mr. W. Falconer in West Yorkshire. 



