On EUROPEAN SPIDERS. 185 
e 
Gen. 12. XYSTICUS (C. Kocn). 1835. 
Deriv.: probably Evorexdc, scraping (£vw, scrape, polish). 
Sım.: 1835. Xysticus C. Koch, in Hrrr.-Scherr., Deutschl. Ins., 129, 16, 17. 
1837. M ID., Uebers. d. Arachn.-Syst., 1, p. 25 (ad partem). 
1861. Thomisus Wesrr., Aran. Suec., p. 410 (ad partem). 
1861. jä Brackw., Spid. of Gr. Brit., I, p. 66 (ad partem). 
1864. Xysticus [Xystica] Sım., H. N. d. Araignées, p. 427 (ad max. part.). 
1864. Oxyptila [Ozyptila] 1D., ibid., p. 440. 
1867. Xysticus OHL., Aran. d. Prov. Preuss., p. 108. 
Type: Aysticus Kochü N. = X. viaticus C. KOCH ?). 
The genus Oxyptila Srw., formed for Thomisus claveatus WALCK., 
appears to me to differ from Xysticus only by the bristles on the body being 
incrassated at the extremity; this is also the case in Thom. scabriculus 
WESIR., which species I cannot generically distinguish from e. g. Xyst. 
brevipes, in which the bristles display, though in a less degree than in Th. 
claveatus and scabriculus, a tendency to become thicker towards the end. 
The name Omwyptila can moreover hardly be retained, on account of its 
signification (from sóc, sharp and riAov, bristle), which is absolutely the 
reverse of the characteristic feature (the club-like thickening of the bristles 
towards the apex) which seems to constitute the principal claim of this group 
to be considered as a separate genus. 
In the genus Xysticus the tarsal claws are very different in the two 
sexes. In .X. cristatus for ex. they are in the female short and strong, 
pretty regularly eurved, with 4 or 5 strong comb-teeth and frequently also 
a finer tooth near the base. In the male the claws are weaker, rather long 
and slender: they are but slightly curved for the greatest part of their length, 
almost straight, with the point turned downwards; the outer elaw has about 5 
sparse and eoarse teeth; on the inner claw the teeth are more numerous, 
for where in the outer claw the inmost tooth is posited, we find in the in- 
ner a group of about 5 closely set, fine teeth. 
1) Aranea viatica Linn. or A. cristatus CLERCK, which C. KocH considers to be 
the same as his Aysticus viaticus, is an entirely different species, and = .X. audax 
C. KocH. — In both species the genital bulb is on the underside, nearer the 
base, provided with two processes: in .X. cristatus that nearest the base is broad, 
compressed, elaw-like, the other is slender and has almost the form of a I or an 
anchor; im X. Kochii, both processes are slender and of about the same substance: 
that nearest the base is bent almost in the form of a boot, the other process has its 
‘short, blunt extremity curved against the foot of the boot. — X. Kochii has not as 
yet been found in Sweden. 
Nova Acta Reg. Soc. Sc. Ups. Ser. III. 24 
