444 REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. [May 6, 



on the margins forwards ; it is on the whole rather flat ; but the 

 caput is convex and rounded above, on the sides, and at the occiput, 

 the profile line from that part to the lower margin of the clypeus 

 forming a regular arc of a circle ; there are a few hairs grouped 

 among and chiefly immediately behind the eyes ; and the height of 

 the clypeus is half that of the facial space. 



The eyes are small and differ but little in size ; they are in the 

 ordinary position, on the fore slope of the arc above mentioned ; 

 those of the hind central pair are rather nearer together than each 

 is to the hind lateral on its side ; those of each lateral pair are 

 seated obliquely and contiguously to each other on a black tubercle ; 

 those of the fore central pair are contiguous to each other, and each is 

 separated by about an eye's diameter from the fore lateral on its side. 



The legs are moderately long, not very strong, of a bright yellow 

 colour, furnished sparingly with hairs and a few prominent, slender, 

 spine-like bristles. 



The palpi are rather short, similar in colour to the legs, except 

 the digital and fore part of the radial joints, which are dark brown ; 

 the cubital and radial are short, the latter much the strongest, enlarged 

 or spreading at its extremities, and its fore extremity on the upper- 

 side produced into a pointed oval termination, which, looked at in 

 profile, has a hooked appearance ; this joint has numerous hairs on 

 its outer side. The digital joint is of moderate size and somewhat 

 oblong form. The palpal organs are well developed and complex, but 

 presenting no very remarkable corneous process ; one, however, 

 rather large and of an irregular curved form, is situated at the base 

 on the outer side immediately below the radial joint, and from one 

 of its prominent points issue two or three strongish bristly hairs. 



The falces are vertical, rather long, moderately strong, of the same 

 colour as the cephalothorax, and covered with tolerably strong sharp 

 teeth towards their extremities on the inner side. 



The maxillce and labium appeared to be of normal form, and, with 

 the sternum, are similar to the falces in colour, the latter, however, 

 having a mottling of black-brown over its surface. 



The abdomen is oval, moderately convex above, black, thinly 

 clothed with hairs, and not projecting over the base of the cephalo- 

 thorax. In spirit of wine some pale mottlings and lines are visible. 



A single adult male of this Spider was contained in M. Tacza- 



' nowski's Siberian collection ; it seems to approach more nearly to 



Walckenaera hardii (Bl.) (Leptothruv clavipes, Menge) than to 



any other of the genus ; it is, however, easily distinguished from 



that species in the form of the caput. 



Erigone (Neriene) taczanowskii, sp. n. (Plate XLI. fig. 10.) 



Adult male, length 1| line ; female adult, 1| hue. 



Cephalothorax oval, much broadest behind ; lateral constrictions on 

 margins scarcely visible, moderately convex above ; occiput roundly 

 convex ; fore part of the caput rather produced forwards : clypeus 

 retreating and equal in height to nearly two thirds of the facial space ; 

 its colour is a dark rich yellow-brown, the normal grooves and inden- 



