4f>0 REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. [May 6, 



between them (or perhaps it may be described as forming the outer 

 corner of the inner apophysis) is a longish tapering pointed one, 

 whose extreme point is slightly bent ; the digital joint is of tolerable 

 size ; and the palpal organs are highly developed but not very com- 

 plex ; from near their extremity on the outer side issues a strongish 

 black, filiform, tapering, sharp-pointed spine, which curving back- 

 wards forms a large circle rather behind them and beneath the 

 cubital joint ; in connexion with a portion of this spine is some 

 whitish semitransparent membrane. 



The falces, ma.villce, and labium are of ordinary form and similar 

 in colour to the cephalothorax, the sternum being suffused with 

 dusky brown. 



The abdomen is oval, moderately convex above, of a yellowish 

 colour suffused with dusky brown, thinly clothed with short fine 

 hairs, and showing (in spirit of wine) some pale lines and markings. 



An adult example of this very distinct little Spider, which reminds 

 one (in its general appearance as well as in some of its special 

 characters) of Erigane diceros (Cambr.), was contained in the col- 

 lection received from M. Taczanowski and made in Siberia by Dr. 

 Dybowski, with whose name I have much pleasure in connecting it. 



Erigone (Walckenaera) subrostrata, sp. n. (Plate XLI. 

 %• 14.) 



Adult male, length nearly 4 of a line. 



This Spider is very closely allied to E. picina (Bh), which it 

 resembles remarkably in colour, form, and structure ; it is, however, 

 rather smaller; the caput is rather less elevated, and the clypeus 

 more prominent, forming at its lower margin a kind of broad bluntish 

 nose-like prominence ; the height of the clypeus very slightly 

 exceeds half that of the facial space ; and a distinguishing character 

 by which it may be at once separated from E. picina is furnished 

 by the radial joint of the male palpus ; this instead of being produced 

 at its fore extremity on the upperside into a long tapering slightly 

 curved apophysis, has the curved portion more sharply bent into a 

 nearly circular form, with the extreme point (which is blunt) sticking 

 rather prominently upwards ; there is also some difference in the 

 structure of the palpal organs ; with the exception of the difference 

 above noted the radial joint is remarkably similar to that of E. picina, 

 though the curved portion is perhaps in the present species rather 

 less strong and darker-coloured. 



These differences, though slight, were constant in six examples 

 compared with a great many of E. picina ; and I have therefore no 

 hesitation in deciding it to be a distinct, though very nearly allied, 

 species. 



The colour of the cephalothorax and other fore parts is a rich, 

 shining brown, that of the legs and palpi yellow, tinged with orange, 

 the abdomen being jet-black. 



Adult males were contained in the Siberian collection received 

 from M. Taczanowski. 



