134 ON NEW AND BARE BRITISH ARACHNID A. 



Abdomen oblong-oval, the upper side dull black and 

 thinly furnished with fine black hairs. The underside is 

 marked with an indistinct broken marginal whitish line on 

 each side, and the spiracular plates are white. Spinners 

 short and of a dull yellow-brown hue. On the underside 

 of the abdomen, rather less than half way between the 

 spinners and the genital aperture, is a longish transverse 

 slightly curved fold in the epidermis, which has the appear- 

 ance of being a perforated aperture ; but this may be only 

 from a shrinking of the skin. The genital aperture is of a 

 distinctive and characteristic form. 



A single example found at Net hy bridge, Scotland, by 

 Mr. H. Donisthorpe. 



Entelecara errata, sp.n. p. 119. Figs. 18-21. 



Adult male, length J of a line (or 1-1 6th of an inch) ; length 

 of a female slightly more. 



This minute spider is closely allied to Entelecara omissa, 

 Cambr., and has been hitherto recorded under that name. 

 It is, however, rather larger, and although corresponding in 

 its general form, appearance, and structure, the following 

 differences, among other lesser ones, seem to be sufficient to 

 justify its being considered a distinct species. The eyes of the 

 hind-central pair are distinctly nearer together, the interval 

 between them being little, if anything, greater than an eye's 

 diameter, while that between those of the corresponding 

 pair in E. omissa is much greater. The palpi also of the male 

 differ ; the digital joint in both has a similarly curved, 

 concave production of its extremity, but the prominent 

 process issuing from its concavity is longer and not clavate, 

 nor is it smooth at its extremity like that in E. omissa ; this 

 extremity in E. errata is apparently roughened and furnished 

 there with some minute points or denticulations. The 

 genital aperture in the female also differs slightly in its form 

 and structure. 



