234 



metatarsi is also a good characteristic. The vulva consists of a large, 

 transversal, deep fovea, exhibiting at the bottom two longitudinal 

 ridges; behind and immediately adjoining this fovea there seems to 

 be a shallow depression. Of this ? I have but one dried specimen. 



(Pag. 414). 2. Th. bifasciatus [= Xysticus bifasciatus C. Koch 1837]. 



Syn.: 1837. Xysticus bifasciatus C. Koch, Uebers. d. Arachn.-Syst., 1, p. 26. 

 1838. „ „ id., Die Arachn., IV, p. 59 {saltern ad part.: 



?), Tab. CXXV, figg. 287, 288. 

 1845. „ LANIO id., ibid., XII, p. 77 (ad part., "Var. maris":), Tab. 



CCCCXIV, fig. 1011. 

 1861. Thomisus bifasciatus Blackw., Spid. of Gr. Brit., I, p. 79, PI. IV, 



fig. 46. 



This species has been remarkably well and completely described 

 by Westring both as regards form and colour: we will only add 

 that the vulva is composed of a large , deep , rounded or at least in 

 front more truncated fovea, continued backwards by a narrower and 

 shallower depression (thus nearly resembling a key-hole); a dark 

 spot is usually found on each side of this depression. English spe- 

 cimens of llwm. bifasciatus Blackw., both cT and ?, have been kindly 

 sent to me by Cambridge; I have also received from L. Koch a cf 

 of this species under the name of "Xysticus bifasciatus C. Koch," so 

 that this name appears to be generally received for the spider here 

 treated of. C. Koch appears however to have described the male of 

 this species, or at least some variety of it, as a variety of X. 

 lanio (see synom.). 



The bulbus genitalis has in X. bifasciatus on its under side, near 

 the base, two strong, long, spine-like processes, which the greater part 

 of their length run parallel with each other, only with their inward curv- 

 ed extremities diverging at an acute angle. These two long spines 

 generally lie so close together, that they seem to form but one pro- 

 cess cloven at the extremity, but sometimes they are more or less 

 widely separated. The anterior one has, somewhat above the point 

 where it bends inward, an outward-curved tooth. The cephalotho- 

 rax is strongly and regularly convex; the forehead abruptly truncated. 



The spider described and figured by C. Koch (loc. cit., fig. 286) 

 as the male of X. bifasciatus, I cannot venture to include in this 

 species: it is stated to be far smaller than is the real male X bi- 

 fasciatus, and the pattern on the abdomen is said to be light yellow, 



