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Show 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 aud 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. Tbe 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 maxillee 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 cephalothorax. In spirit of wine some pale mottlings and lines are visible. A single adult male of this Spider was contained in M . Taczanowski's Siberian collection; it seems to approach more nearly to Walckenaera hardii (Bl.) (Leptothrix 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, If line. 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- |