242 F. P. SMITH OX THE SPIDERS OF THE WALCKENAERIA GROUP. 



1870-3. Erigone saxicola, Tbor., Rem. on Syn. 

 1879-81. Walckenaera saxicola, Cambr., S]rid. Dorset. 



1883. Lophomma saxicolum, Bertkau, Spin. Rheinp 



1884. TigeU 'in us saxicolus, Sim., Ar. de France. 



Genus Arrecerus, Sim., 1864. 



1834. Theridium, Wid., Zool. Misc. {ad partem). 

 1837. Argus, Walck., Ins. Apt. {ad partem). 

 1861. Erigone, Westr., Ar. Suec. {ad partem). 

 1864. Arrecerus, Sim., Hist. Nat. Araig. {ad partem). 

 1864. Walckenaera, Bl., Spid. G. B. I. {ad partem). 

 1868. Lophomma, Menge, Pre ass. Spin, {ad partem). 

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

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

 1879-81. Xeriene, Cambr., Spid. Dorset {ad partem). 

 1884. Prosopotkeca, Sim., Ar. de France. 

 1900. „ Cambr., List Br. Ir. Spid. 



The genus Arrecerus was formulated by Simon in 1864 for 

 two species — A. camelinus, Koch (= acuminatus, Bl.), and A. 

 monoceros, (Wid.). The former was removed by Menge in 1868 

 (under the name corwatus, Wid.) to his genus Phalops, leaving 

 monoceros, (Wid.), as the type of Arrecerus. Simon, in 1894 {/list. 

 Nat. Araig.), selected monoceros, (Wid.), as the type of Prosopotkeca, 

 Sim., but this is impossible, since the species in question is the 

 type of Arrecerus, 



Type: A. monoceros, (Wid.). 



Arrecerus monoceros, (Wid.), 1834. 



1834. llteridium monoceros, Wid., Zool. Misc. 



1837. Argus monoceros, Walck., Ins. Apt. 



1861. Erigone monoceros, Westr., Ar. Saec. 



1864. Arrecerus monoceros, Sim., Hist. Nat. Araig. 



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



1868. Lophomma cristatum, Menge, Preuss. Spin. 



1870-.*;. Erigone monoceros, Thor., Rem. on Syn. 



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



1884. Prosopotheca monoceros, Sim., Ar. de France. 



1886. Lophomma monoceros, Dahl, Monog. Frig. 



1900. Prosopotheca monoceros, Cambr., List Br. Ir. Spid. 



