18/3.] REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. 437 



side is furnished with long, strongish, bristly hairs ; and the under- 

 side of the abdomen is of a dull yellowish hue, suffused more or less 

 with dusky blackish ; the spinners have a supernumerary one (or 

 united pair) in front of the usual six. 



The female resembles the male in colours and markings, and has 

 calamistra on the outer side of the metatarsi of the fourth pair 

 of legs. 



This Spider is nearly allied to L. puta (Cambr.), but may be at 

 once distinguished by the cubital joint of the male palpus being 

 merely gibbous, and not prominently pointed at its fore extremity 

 as in that species, and in the less size of the spiral spine at the 

 outer extremity of the radial joint. The present is also a more di- 

 stinctly marked and more largely blotched-looking Spider, and of a 

 darker or richer colour ; the pale triangle on the upperside of the 

 abdomen, as well as the larger size of the spiral spine at the outer 

 extremity of the radial joint of the male palpus, and the greater 

 development of its free extremity, seem also to be good specific 

 differential characters. 



An adult male and an immature female were contained in the 

 Siberian collection received from M. Taczanowski, with whose name 

 I have much pleasure in connecting it. 



Fam. Theridiides. 

 Gen. Linyphia. 



Linyphia karpinskii, sp. n. (Plate XL. fig. 2.) 



Adult male, length 1 line. 



The whole of the fore part of this Spider (including the legs and 

 palpi) is of a pale orange-yellow colour ; the colour of the abdomen 

 is of a duller hue, in some examples suffused with a sooty brown. 

 It is nearly allied to L. angulipalpis ( Westr.), both in form and 

 colour, but may be distinguished by its less size and paler colour, as 

 well as by the form of the cubital joint of the male palpus ; in L. 

 angulipalpis this joint has the middle of the fore side of an angular 

 and almost sharply prominent form, while in the present species it 

 is prominent but far more obtuse. The palpal organs also differ in 

 their structure. 



The legs are furnished with a few hairs and some long spines ; 

 they are rather long and moderately strong, their relative length 

 being 4, 1,2, 3. 



The maxillce are curved and inclined towards the labium ; and the 

 height of the clypeus, which is impressed below the eyes and pro- 

 minent at its lower margin, exceeds half that of the facial space. 

 The prominent portion of the cubital joint of the palpus (male) ter- 

 minates with a tolerably strong, slightly bent, black, tapering 

 bristle ; and there is another less strong one issuing from the fore 

 side of the radial joint ; both joints are furnished with a few other 

 hairs. The palpal organs are well developed and complex, con- 

 sisting of several curved and other corneous spines and processes. 



The female of this species is easily distinguished from that of L. 



