572 



In X. praticola cf the inferior process of the tibial joint is di- 

 rected forwards, somewhat dilated and curved upwards at the apex, 

 in X. pnsio cf it is directed forwards and downwards, its apex is 

 straight and is not dilated. (In A". Westringii the process points 

 downwards and forwards and is slightly curved downwards at the apex). 

 The spine, into which the outer side of the tibial joint is produced, 

 is in X. praticola directed dowmvards and forwards, and is to- 

 lerably powerful, curved at the apex and base somewhat spirally or 

 so as to form almost a ~; in X. pusio this spine is directed forwards 

 (hardly at all downwards), parallel with the margin of the lamina, 

 aud is fine, almost straight, scarcely sensibly --shaped. (In X. brevipes 

 the --shaped spine is shorter and stouter, stouter than the inferior 

 process: in X Westringii the spine is C-shaped and the outer side 

 of the tibial joint much dilated and thickened). 



The vulva in X. praticola appears, when the animal is examined 

 lying in a fluid, to consist of a transverse pale area, bounded by two 

 fine, dark, C-shaped costse uniformly curved towards each other: in the 

 anterior portion of this area are seen two small dark spots. When 

 the animal is examined dry, it appears that the anterior portion of 

 the vulva encloses two rounded excavations, bounded internally and 

 posteriorly by the anterior extremity of the afore-said C-shaped costxe, 

 which extremity is drawn out backwards; externally and posteriorly 

 they are bounded each by a separate C-shaped, low, broad and shining 

 elevation; each of these excavations encloses one of the dark de- 

 pressed spots; between them a fine elevated line extends backwards. 



The synonyms of the species here treated of must of course be 

 disposed in a manner quite different from that, in which we have 

 exhibited them pp. 254, 255. For Th. brevipes Westr., Aran. Suec, 

 p. 438 (= Xysticus Westringii n. + X. praticola G. Koch 1837), they 

 take the following form: 



"Mas" (X. Westringii): 

 Syn.: |1851. Thomisus brevipes Westr., Forteckn., cet., p. 50 (salt, ad part.). 

 -f-1867. Xysticus praticola Ohl., Aran. d. Prov. Preuss., p. 117 (salt. $ 



ad part.). 



1872. „ brevipes Thok. , x Piein. on Syn., p. 254 (ad part., salt. i). 



1873. „ Westringu id., ibid., pp. 412, 427. 



"Femina" salt, ad part. (X. praticola): 

 Syn.: 1851. Thomisus incertus Blackw., Spid. of Gr. Brit., I, p. 86, PI. IV, 



fig. 51. 



fl855. Xysticus brevipes Thor., Eec. crit. Aran., p. Ill (■=£). 

 Cet. Syn. vid. sup., pp. 426, 427. 



