34 



With regard to the differences in the structure of the organs 

 of copulation between this and other nearly related European species 

 of the genus Zilla , see the next following species , Z. Montana Westr., 

 and the short descriptions of Z. Koclrii and Z. Rossii given in the 

 preceding foot-note. 



(Pag. 73.) 3. Z. montana [= ZiUa Struemii Thor. 1870]. 



Syn.: 1833. Epeiba calophylla Var. b Sond., Sv. Spindl. Beskr., in Vet.-Akad. 



Handl. f. 1832, p. 253. 



1851. „ MONTANA Westr., Forteckn. etc., p. 35. 



1856 Zilla x-notata Thor., Eec. crit., p. 26. 



1858. ,, MONTANA id. , Om Clercks Origin.-spindelsaml., p. 148. 



1867. „ calophylla Mbkgb , Preuss. Spinn., I, p. 76, PI. 12, tab. 19. 



1870. „ strcemh Thor., On Eur. Spid., p. 235. 



On Araneus x-notatus Clerck and Zilla calophylla Menge we have 

 treated in the preceding article. The species that Westrtng describes 

 under the name of Zilla montana, and of which I have above given 

 the synonyms, is by no means the same as C. Koch's Z. montana 

 (Herr.-Schjsff. , Deutschl. Ins., 125, 19; Die Arachn. , VI, p. 146, 

 PL CCXV, figg. 536, 537). In colour, and often in size, there is indeed 

 a considerable likeness, but Westring's spider is easily distinguished 

 by the form of the organs of copulation, which have an appearance 

 quite different from that of the real Z. montana. In this latter species 

 the vulva is very short, not, as in Westring's species, drawn out 

 into a long, backward turned stilus, and is accordingly more like 

 the vulva of Z. x-notata and Z. atrica. Westring's Z. montana I 

 have called Z. Straemii (in memory of the distinguished Norwegian 

 naturalist H. Strom). The real Z. montana differs from Z. atrica, Z. 

 x-notata and Z. Straemii in having the sternum of a uniform dark- 



notata, ssepissime linea quoque vel vitta angusta nigra a macula ilia ad medium 

 saltern dorsi ducta ; latera abdominis versus basin vitta abbreviata nigra plus minus 

 distincta et interdum postice maculis nigris notantur; venter niger, vittis duabus 

 albicantibus , unea vel vitta angustiore media nigra separatis, interdum totus sub- 

 cinereus; vulva ex callo tomato transversa nigro tantum constat. — J ad., long. 

 c:a 5 mill. Long, cephalotlior. c:a 2, abdominis c:a 4, pedum l mi paris 5y 2 — 7, 

 pedum 3 ti; paris 4 — 4'/ 2 millim. 



Pedibus non aculeatis, forma vulvae, colore, magnitudine minori et brevitate 

 pedum anteriorum a reliquis hujus generis facillime dignoscenda. — $ ignotus. 



Ad Nizza et Monaco non raro inventa. Nomine Cel. P. Eossn hanc speciem 

 ornatam volui. 



