248 



The bulbus genitalis in X. ulmi cf has beneath, near its base, 

 on a common protuberance, two short, pointed spines, curved in 

 the form of a crescent, of which the exterior, situated nearest to 

 the base, is the smaller, and is bent inward and somewhat forward, 

 the other being curved backwards; in most positions they appear to 

 be curved in opposite directions. The lateral process of the tibial 

 joint is very short and blunt, not in length exceeding its own breadth 

 at the base, where it joins the inferior process of the joint: this 

 process is broad, and its length somewhat greater than its breadth; 

 it is rather narrowed towards the extremity, where it is obliquely 

 truncated and rounded, so that the anterior edge is a good deal 

 shorter than the posterior, uniformly convex border: the anterior 

 angle is not acutely produced, but obtuse; the posterior angle is 

 rounded off; a little notch in the rounded apex itself is sometimes 

 visible. The process is longitudinally hollowed, with the lateral 

 edges thickened. Immediately in front of the apex of the tibial 

 joint's lateral process, a fine pointed spine projects from the external 

 margin of the bulbus, directed outward and curved forward and 

 upward ; the lamina itself appears to have no process on its margin. 



The female's vulva consists of a very small, almost triangular 

 fovea truncated in front and narrowed behind, bounded by two short 

 costse converging backwards, and with a narrow, scarcely visible 

 longitudinal septum in the pale bottom. A slight depression behind 

 the fovea is seen in this as in most of the related species. 



English specimens of X. ulmi have been kindly sent me by 

 Cambridge under the appellation Th. Westwoddii Cambr. ')• — On X 

 erratieus (Blackw.) and X. bifasciatus C. Koch <?, see above p. 234. 



(Pag. 428.) 9. Th. lilieatllS [= Xysticus lineatus (Westr.) 1851]. 



Syn.: 1851. Thomisus lineatus Westr., Forteckn. etc., p. 61. 



This remarkable species, which is easily recognized both by its 

 colour and the form of its palpi (Conf. Westring's description), ap- 

 pears not to be mentioned by any other writer than Westring. 



1) Cambridge says (loc. cit. , p. 405) that he has received specimens of Th. 

 Westwoodii from Dr KOCH, of Nuremberg, under the uame of Thorn. (Xysticus) 

 audax; this however must depend on some casual mistake; for Dr L. Koch 

 and several other German authors give the name X. audax to X. cristatus 

 (Clerck), as I see from specimens sent to me by L. Koch, Ohlert and Zimmermanx. 



