232 rev. o. p. Cambridge on the [Feb. 20, 



Genus Drassus (Walck.). 



Drassus lapidicolens, "Walck. Ins. Apt. i. p. 598. 



Both sexes, adult and immature, were found in various localities 

 throughout the country, but nowhere in any abundance. The ex- 

 amples were some of them much larger than the examples I have 

 usually found in England. 



Drassus troglodytes, Koch, Die Arachn. vi. p. 35, pi. 1*9. 

 figs. 455, 456 = D. clavator, Cambr. Ann. & Mag. Nat. Hist. March 

 1860. 



Adult examples of both sexes of this well-characterized species 

 were found under stoues occasionally throughout the country. 



Drassus morosus, sp. nov. (Plate XV. fig. 9.) 



Male adult, length 2| lines. 



This Spider is of ordinary form, and is nearly allied to D. troglo- 

 dytes, but may at once be distinguished both by the structure of the 

 palpi and palpal organs and by the pattern on the abdomen. The 

 whole of the fore part (including the legs and palpi) is of a pale 

 yellow colour ; but as the Spider had evidently not long since under- 

 gone its final moult, probably its general colouring would have been, in 

 a short time, darker. The eyes of the hinder row are equidistant from 

 each other, those of the central pair being oval and placed obliquely ; 

 those of each lateral pair are removed from each other by about an 

 eye's diameter ; those of the fore central pair are further from each 

 other than each is from the lateral on its side. The leys are rather 

 long and strong, particularly those of the first pair ; their relative 

 length is 1, 4, 2, 3 ; they are clothed sparingly with hairs aud a 

 few fine spines. 



The palpi are short and strong ; the radial is equal in length to 

 the cubital joint ; the former is produced at its fore extremity into a 

 strong tapering apophysis, which, when looked at from in front, is 

 indented towards its extremity on the inner side, and slightly hollow 

 on the outer side ; its extremity is obliquely but rather roundly 

 truncated on the inner side; the digital joint is large and oval in 

 form, and as long as the radial and cubital joints together, including 

 the apophysis of the former : the palpal organs are prominent, but 

 not very complex, with some small spiny corneous prominences to- 

 wards their extremity. The falces are long, strong, and projecting, 

 aud very prominent at their base in front. The abdomen is of an 

 oblong-oval form and of a dull brownish-yellow-grey colour, thickly 

 marked on the sides and above with short black striae, black suffu- 

 6ions, and with several sharply angular black bars or chevrons on 

 the hinder part of the upperside ; taking, however, the blaek por- 

 tions as the ground-colour, there are six rather conspicuous yellow- 

 grer Mo'ch^s visible on the fore part of the upperside, in three 

 pairs, or two longitudinal curved lines, the curves directed towards 

 each other ; those of the hinder pair are the largest, and are situated 

 about one third of the length of the abdomen from the spinners ; 



