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Show 1873.] REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. 439 stripes into a large, irregular, brown-black patch on the lower parts the sides. Some little variety exists in the size of the blotches and stripes and extent of the lateral patch ; and in the male they are all less strongly marked, and of less extent, than in the female. The blotches on the upperside only reach to about one third of the length from the fore margin of the abdomen ; the underside is of a suffused sooty-brown hue. There is nothing unusual in the general form and structure. The eyes are on strong and sometimes nearly confluent black spots ; those of the hind central pair are further from each other than each is from the hind lateral on its side; but a striking and distinguishing character of the male consists of a strong, curved, horn-like, semidiaphanous, pointed spine, which rises from immediately behind the hind central eyes and arches forwards over the ocular area. The palpi have the radial and cubital joints short, but of about equal length; the latter is prominent, in a somewhat angular form at its fore extremity on the upperside; and from that prominence issues a long and strong spine-like bristle, dilated on tbe inner side, rather more than halfway towards its fine point, into a largish, flat, semicircular dilatation ; this spine-like bristle is more than double the length of the joint itself, and is slightly bent, and with an outward direction. The digital joint is large; and the palpal organs are well developed, prominent, and complex, with dark red-brown corneous processes and spines. The legs are long, moderately strong; their relative length appeared to be 1, 4, 2, 3 ; but it was impossible to decide this with accuracy, owing to the contorted state of the legs, which it was impracticable to expand without fracture ; they are furnished with hairs and spines. The process connected with the sexual apper-ture of the female is characteristic in form and prominent. Both sexes (adult) of this species were contained in the Siberian collection received from M . Taczanowski. It is allied to L. angulipalpis (Westr.) in the angular form of the cubital joint of the male palpus, but, perhaps, more nearly to L. minuta (BL), departing from the angulipalpis group by having on the abdomen a distinct pattern nearly approaching in its character to the ordinary Linyphia type ; but the peculiar curved horn-like spine on the caput, and the uuusual strength and form of the spiny bristle at the fore extremity of the cubital joint of the palpus, will serve to distinguish it at a glance from any other recorded species known to me. LINYPHIA TACZANOWSKII, sp. n. (Plate XL. fig. 5.) Adult female, length ITJ line (nearly). The cephalothorax of this Spider is of a darkish obscure yellow-brown, the normal grooves and indentations, as well as the margins and the longitudinal central line, being suffused and indicated by darker brown. The falces, maxillee, and labium are of a similar colour to the cephalothorax, the sternum being black-brown ; all these portions of structure are of the usual type, and appear to need no special detail. The height of the clypeus is about equal to half |