1873.] REV. O. p. CAMBRIDGE ON SIBERIAN SPIDERS. 449 



In regard to the differences between the palpal structure of this 

 and the other species mentioned, E. unicornis and E. kochii, it will 

 be sufficient here to note that presented by the apophyses of the 

 radial joint: in neither of these species do the two cross each other 

 as in the present case ; in E. unicornis the extremity of the outer 

 apophysis is dilated and not merely obtuse as in E. karpinskii, while 

 the ex remity of the inner one is not bifid as in this species: in 

 E. kochii the outer apophysis has its extremity not only dilated but 

 strongly bifid, while its inner one is simplv obtusely pointed 



Both sexes of this very interesting Spider were contained in the 

 bibenan portion of the collection received from M. Taczanowski • 

 and I have much pleasure in naming it after M. Karpinski, by whom 

 the Kiew portion of the collection was made. 



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

 ng. 13.) 



Adult male, length f of a line. 



The cephalothorax of this curious little Spider is short oval in 

 form, and moderately convex above, and its colour is yellow, slightly 

 suffused and marked on the margins and normal grooves and inden- 

 tations with brown ; the caput is slightly raised on the upper part, 

 the rased portion also marked out by a dusky blackish marginal line 

 indented at the occ.put, immediately behind which is a dfprasion 

 The clypeus exceeds in height half that of the facial space, and is 

 prominent at its lower margin ; on either side of the upper part of the 

 caput forwards and immediately behind each lateral pair of eyes is 

 a small roundish pit or indentation, from which issues a small black 

 s lightly curved, prominent, sharp, thorn-like spine; this spine, from 

 its nature and position is a strong and remarkable specific character 

 Ine eyes are tolerably equal in size, and seated on small black 

 spots; they are in four pairs, forming a rather narrow transverse 

 oval figure, each pair being rather widely removed from the others 

 nearest to it; those of the hinder pair appeared to be of an oval 

 form and separated from each other by little, if any, more than half 

 ofan eyes diameter; those of the fore central pair are very near 

 but (apparently) not quite contiguous to each other, and their 

 straight hue, when looked at from the front, is above that formed 

 by the foremost eyes of the two lateral pairs ; the eyes of each of 

 these last pairs are cont.guous to each other, and seated rather 

 obliquely on a small tubercle ; the figure formed by the eyes of the 

 fore central and hinder pairs is a longish narrow trapezoid, whose 

 length is nearly about double its breadth. 



The legs are moderately strong, but not very long; they are of a 

 yellowish colour strongly tinged with reddish yellow-brown, and 

 furnished sparingly with hairs and a few short, erect, black bristles • 

 their relative length appeared to be 4, 1, 2 3 



The palpi are short and of a yellow colour, except the digital 

 joint which is brownish ; the radial is shorter than the cubital joint 

 and has three apophyses from its extremity -one (a small pointed 

 one) on the outer side, a large broad one" on the inner side a„1 

 Paoc. Zool. Soc— 1873, No. XXIX. 29 



