237 



with the species found by me at Travemiinde. In Sweden this X. 

 viaticns has never yet been observed , and hence it is clear, that the 

 specific name viaticus, which was given by Linnaeus to a Swedish 

 spider, and which without doubt is synonymous with cristatus Clerck, 

 cannot be retained to Koch's X. viaticus, which species I therefore (On 

 Eur. Spid, p. 185) have called X. Kochii; and I shall farther on 

 mention some of the characteristics, whereby it may be distinguished 

 from X. cristatus. 



The other synonyms entered upon my list are not all equally 

 certain. We shall first examine that taken from Westring. Thorn, 

 ciner ens Westr. is a spider very common in Sweden, and to which 

 Westring appears to me rightly to refer Hahn's Thorn. pint (= Xyst. 

 mordax C. Koch, according to Koch himself), as also X. cinereus 

 C. Koch ')• Westring was acquainted only with the female of his 

 "Th. cinereus", which differs in colour only from X cristatus, the 

 form of the vulva being perfectly alike in "Thom. cristatus" and 

 '"Thorn, cinereus". I also possess a suite of varieties of these two 

 forms, which show that they gradually pass into one another. I have 

 an adult male, that had probably changed its skin shortly before 

 it was captured, and which, as regards the colours of the cephalo- 

 thorax , abdomen and legs , is very unlike the varieties most usually 

 met with of X. cristatus, but on the other hand so like Westring's 

 Thom. cinereus Q, that I was satisfied as soon as I had obtained 

 it, that it was the male of this Westringian species — and yet its 

 organs of copulation appeared on closer examination to be precisely 

 similar with those of "Th. cristatus" c?. For these reasons I can no 

 longer avoid the conclusion that Thom. cinereus Westr. (as also X. 

 cinereus Koch and Thom. pmi Hahn, as far as these are identical 



1) Dr L. Koch has obligingly sent me a spider from the vicinity of Nurem- 

 berg, which he suspects may be identical with X. cinereus C. Koch; but, as it seems 

 to me to have but little similitude with the figure given by C. Koch of his X. ci- 

 nereus (Die Arachn. . loc. cit.), I believe it is quite a different and new species, 

 which may be called X. acerbus. It is, by the form of the genital bulb, more 

 nearly allied to X. calcarutus, X. luctuosus etc. than to X. cristatus, and may be 

 easily recognized by the peculiar form of the processes of the tibial joint in cf. 



Xysticus acerbus N. — Mas. Cephalothorax fere 3 millim. longus, dorso 

 sub-recto, fronte truncata, non rotundata; ferrugineo-fuscus , macula V-formi po- 

 stica sub-testacea, antice lineis ejusdem coloris duabus minus distinctis continuata 

 et partem cephalicam ita includenti , hac parte lineis 3 longitudinalibus clari- 

 (uibns minus distinctis , fasciaque transversa albicanti inter series oculorum notata. 

 Sternum et partes oris ferrugineo-fusca, clarius sub-variata. Palpi ferrugineo- 



31 



