197 



(Pag. 356.) M. petrensis [= Melanophora mmren* N.]. 



Sijn.: f 1851. Deasstjs petkensis Wkstr., Forteckn. etc., p. 47. 



This is quite a different species from that, which according to 

 L. Koch ') is the i/. petrensis of C. Koch 2 ), and for which I retain his 

 name (see preced. spec.) : that spider has no spine on the tibiae of the 

 2 nd pair, and is also distinguished by an entirely different form of 

 the vulva (see L. Koch's figure, loc. cit., fig. Iu7, and our description 

 above). The vulva in Westeing's M. petrensis closely resembles the 

 figure given by L. Koch of that organ in his M. prafica (loc. cit., 

 p. 155, Taf. VI, fig. 97), but it is not narrower behind than be- 

 fore, and behind the two shepherdscrook-like [ir] costse (which 

 are shorter than in the figure referred to, as also more semicircular) 

 one sees a little reddish brown, almost rhomboidal area bounded 

 by fine furrows, with the obtuse angle forward, behind which the 

 low costa enclosing the whole vulva, and which is slightly rounded, 

 low and broad behind, is slightly depressed in the middle. Westeing's 

 M. petrensis has, under the tibia? of the 2 nd pair near the middle, 

 one spine, and under those of the 1 st pair none. M. prcefica is on 

 the contrary stated to have 1, 1 spines under both the first pairs' 

 tibia?. The posterior central eyes do not appear to me larger than 

 the posterior lateral; the interval between them is at least as great 

 as that between the anterior central eyes; the area of the 4 central 

 eyes is evidently broader behind than before. The cephalothorax is 

 as long as the patella and tibia of the 4 th pair together, the length 



paris 8, 2:di fere 7, 4:ti 9'/ 2 millim.). Tarsi et metatarsi 4 antici scopula densa 

 prtediti. Area oculorum medic-rum paullo longior quam latior, postice latior quam 

 antice; medii postici aeque saltern longe inter se distantes atque medii antici, qui 

 spatio oculi diametrum aequanti inter se remoti sunt. Mandibulse setis forma or- 

 dinandi sparsae. Forma vulvae in specimine viso non extricanda; a vulva M. petren- 

 sis L. Koch forsitan parum diversa(?). Totum fere corpus cum metatarsis nigrum; 

 abdomen supra cyaneum colorem sentit, in reliquis corporis partibus in pi- 

 ceum exit color, praesertim subtus. — Praeterera cum M. Petiverii omnibus fere 

 numeris congruere vidctur haec species. A M. atra (Late.) differt spina non 

 tautum sub tibiis 2:di, sed sub l:mi quoque paris. M. lutetiana L. Koch (Die 

 Arachn.-fam. d. Drassiden, p. 157, Taf. VI, fig. 100 ; qui tibias anticas ut in 

 WL iristi aculeatas habet, metatarsis et tarsis fusco-testaceis , oculis mediis po- 

 sticis multo majoribus quam reliquis omnibus etc. differre videtur. 

 Ad Gothoburgum Suecise a Cel. Westbing inventa. 



1) Die Arachn.-fam. d. Drassiden, p. 167, Taf. VII, figg. 107—109. 



2) Die Arachn., VI, p. 89, Taf. CCII, figg. 494, 495. 



