of the Genera of the Araiieje. 15 



^'(•niis Eucharia of 1835. This action, however, does not 

 constitute a withdrawal of this species from the possibility of 

 servin}^ as the ty|)e of Zygia^ because a withdrawal could 

 only be effective if made at the time when the genus was first 

 founded. 



In 180G Menge placed calophylla^ Koch, under Zllla, and 

 atrica, Koch, under Ztjjjia ; but this action, again, does not 

 constitute a limitation or selection of a type, and either of the 

 two species involved may still be the type of Zyijia. 



I am not able to find that any type has ever been definitely 

 selected for Zi/gia, and I therefore select as the type the 

 species representeil by the male figured by Koch, Heft 12."5 



Type, Zygia cihphi/Ua (WAck.), al partem, = Zi'ac/iaym 

 atrica^ C. L. Koch, 1844. — Europe. 



Zygiella, nom. nov. for Zygia, preoccupied by Fabricius 

 for Coleoptera, 1775. 



I here propose the name Zygiella in the place of Zygi't, 

 with Z. atrica (C L. Koch) male, Deutsch. Ins. Heft 123 

 (17), as the type. 



Type, Zygiella atrica (C. L. Koch), 1844:, = ^4r. calophylla, 

 Walck., ad partem. 



NuCTOBiA, E. Simon, Hist. Nat. Ar. p. 236 (1864). 



Ten species were originally referred to this genus which 

 were included in the two subgenera J/e/a, C. L. Koch, and 

 Zilla, C. L. Koch. Simon evidently intended the name to 

 be applied to a group embracing these two genera of Koch's ; 

 but so far as the selection of types is concerned, a subgenus 

 and genus rank together on equal terms as groups, without 

 reference to their relative systematic importance. Thorell 

 considers that Nuctobia is not needed because the species 

 included fall under either MeVx or Zilla. But since it is 

 impossible to say what future subdivisions may or may not 

 be made, it is safer to ascertain the type of Nuctobia ; for if 

 a new genus were ever founded upon one or other of the 

 species originally included under it, this name would have to 

 be revived. It is not a " generic nomen nudum," and there- 

 fore has a type species belaiging to it. 



The type species of the two earlier subgenera having been 

 ascertained, tlien the type of Nuctobia will be looked for 

 amongst the residue left in. 



The species originally included are the following : — 

 (1) Mttafusca, Walck., Europe ; (2) M. albomacuLita, Lucas, 



