F. P. SMITH OX THE SPIDERS OF THE DIPL0CEPHALU8 GROUP. 315 



Eusticothrix obscurus, (Bl.), 1834. 



1834. Walckenaera obscura, BL, Researches in Zool. 

 1861. Erigone impolita, Westr., Ar. Suec. 

 1864. Walckenaera obscura, Bl., Spid. G. B. I. 

 1870-3. Erigone „ Thor., Rem. on Syn. 



1879-81. Walckenaera obscura, Cambr., Spid. Dorset. 



1883. Lophocarenum obscurum, Bertkau, Spin. RJteinp. 



1884. Cnephalocotes obscurus, Sim., Ar. de France. 

 1886. Eusticothrix ,, Dabl, Monog. Erig. 

 1894. Xematogmus ,, Ivulcz., Ar. Hung. 



1900. Cnephalocotes „ Cambr., List Br. Jr. Spid. 



Genus Pelecopsis, Sim., 1864. 

 1834. Theridion, Wid., Zool. Misc. (ad partem). 

 1847. Argus, Walck., Ins. Apt. (ad partem). 

 1864. Pelecopsis, Sim., Hist. Nat. Araig. 

 1868. Lophocarenum, Menge, Preuss. Spin, (ad partem). 

 1870-3. Erigone, Thor., Rem. on Syn. (ad partem). 

 1879-81. Walckenaera, Cambr., Spid. Dorset (ad partem). 



1883. Lophocarenum, Bertkau, Spin. Rheinp. (ad partem). 



1884. ,, Sim., Ar. de France (ad partem). 

 1886. Paractenonyx, Dabl, Monog. Erig. 



1894. Br achy centrum, Kulcz., Ar. Hung. 



1900. Lophocarenum, Cambr., List Br. Ir. Spid. 



Type : P. elongatum, (Wid.). 



The genus Pelecopsis was formulated by Simon in 1864 for the 

 reception of a single species, P. inaequalis, (Koch), 1841. This 

 species is apparently identical with T. elongatum, (Wid.), 1834, a 

 spider which has not occurred in Britain, but which appears to 

 be congeneric with the three British species usually placed under 

 the generic name Lophocarenum. This extensive group is greatly 

 in need of revision, and will no doubt be subdivided at some 

 future date. For the present, however, Simon's name Pelecojms, 

 having priority over Menge's Lophocarenum, seems to be the 

 correct title for the genus. Dahl's Brachycentrum (1886) con- 

 tained two species — B. elongatum, (Wid.), and B. moebi, Dahl. 

 F. O. Pickard-Cambridge in 1903 selected i?. elongatum, (Wid.), as 

 the type of Brachycentrum ; but this species, being the type of 

 Pelecopsis, cannot serve. The type of Brachycentrum, therefore, 

 is B. moebi, Dahl. 



