ON BRITISH ARACHNIDA. 103 



Hilaira exeisa, Cambr. 



Adults of both sexes received from Ireland; found by 

 Mr. D. R. Pack-Beresford, in 1908. 



Hilaira pervieax, J. E. Hull (Fig. 4). 



The females, supposed to be those of Hilaira pervieax, 

 J. E. Hull (Proc. Dors. F. Club, XXIX., p. 173), turn out 

 on further research to be those of H. exeisa, Cambr. Rev. 

 J. E. Hull has lately sent me others which appear to be, 

 without doubt, those of H. pervieax, and may readily be 

 distinguished from H. exeisa, by structural peculiarities. 



Gen. TMETICUS, Menge. 



This genus has long been a kind of refuge for many 

 spiders, offering obscure and doubtful characters in respect 

 to their generic allocation. It has been trenched in upon 

 by various authors, but so far without much certain advance 

 towards a readily tangible sub-division into true genera : pro- 

 bably nothing will effect this until much more material is in 

 hand, embracing both sexes, and a good series of individuals 

 from the same locality, and also trom many other localities 

 than those whence examples of the groups have already 

 come. At any rate this much may be, I think, considered 

 certain, that there is only one spider as yet known that can 

 be considered a true type of the genus, and that is the one 

 noted below as Tmeticus affinis, Blackw. Of those of the 

 general group, Tmeticus, Auctt., I have at times gathered 

 some together under some of the genera proposed for them 

 by Kulczynski, Dahl, and other authors, but, excepting most 

 of those retained or placed in Dahl's Genus, Centromerus, 

 my allocations have, I confess, been made more from a 

 certain practical convenience in breaking up a heterogeneous 

 group, than from feeling any certainty as to their real 

 scientific propriety. 



