1873.] REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. 439 



stripes into a large, irregular, brown-black patcb on the lower parts of 

 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 the inner side, rather 

 more than halfway towards its fine point, into a largish, flat, semi- 

 circular 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 ap- 

 peared 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 im- 

 practicable 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. Taczauowski. It is allied to L. anguli- 

 palpis (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 

 unusual 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 1^ 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, maxilla, 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 



