205 



(Pag. 376.) 2. A. atl'OX [= Amaitrobius fenestrate* ^8t»«h) 1768]. 



Si/n.: 1708. Akanea fenestralis Sib0M. Beskr. ov. Norske Ins., 2 St., in Det 



Trondhiemske Selsk. Shift., IV, p. 362, PI. 

 XVI, fig. XXIII. 

 1776. „ „ Mr Li.. , Zool. Dan. Prodr , p. 194. 



1778. „ ATROX De Gekr, Mem., VII, p. 253, PI. 14, figg. 24, 25. 

 1805. Clubiona atrox Walck., Tabl. d. Aran., p. 44. 

 1837. Amacrobius atrox C. Koch, Uebers. d. Arachn.-Syst., 1, p. 15. 

 1841 Ciniflo ,, Blackw., The differ, in the numb, of eyes 



etc., p. 607. 



1843. Amaurobics „ C. Koch, Die Arachn , X, p. 116, Taf. CCCLV, 



fig. 831. 



1861. Ciniflo „ Blackw., Spid. of Gr. Brit., I, p. 140, PI. 



IX, fig. 88. 



1868. AMATJROBIUS ,, L. Koch, Die Arachn.-gatt. Araaur. , Ccel. u. 



Cyb., p. 7. 



1870. „ fenestralis Thor., On Eur. Spid., p. 126. 



Walckenaer is perhaps the only writer, who under Ar. atrox 

 De Geer takes up Strom's Ar. fenestralis. But neither he nor any 

 other of the arachnologists (0. F. Muller, Gceze), who knew of 

 Strom's work, mentions the author's name or the title of his work 

 ("Beskrivelser over Norske Insekter", Descriptions of Norwegian In- 

 sects), but only the periodical ("Det Trondhiemske Selskabs Skrifter", 

 "Acta Nidros.") in which it was published. Strom's specific name 

 has however priority to that of De Geer, and must accordingly be 

 restored. Strom's description of Ar. fenestralis "macula abdominis 

 nigra trigona, cingulo luteo", as the diagnosis runs, is made from 

 a cf jnn.; it is followed by a figure, which leaves no room for a 

 moment's doubt as to what species is intended '). 



It is probable that the south-European A. obustus L. Koch (loc. 

 cit. , p. 28) has been sometimes confounded with A. fenestralis or 

 atrox: at least I have received specimens of it from northern Italy 

 under the name of A. atrox. In the cf ad. of A. obustus the inner 

 process of the tibial joint is longer, more pointed, as also stronger, 

 more curved in an S-form, and directed more inwards, than in A. 

 fenestralis. The middle process, which springs from the base of the 

 inner, is fine and pointed , much longer than it is broad at the base, 



1) A. fenestralis is the only species of the genus Amaurobius , which is 

 commonly met with in the Scandinavian peninsula, where beside this only one 

 more species, A. fcrox, has been observed, and that only on one spot (Goteborg) 

 and very rarely. 



