neio Species of Walckenaeva, Blachio. 91 



pleasure in naming after its discoverer, was sent to me in 

 1880 by Major-General A. W, M. van Hasselt from the 

 neighbourhood of the Hague, Holland. This species appears 

 to be nearly allied to W. sordidata^ Thor. ( W. atra, Bl.), a 

 spider I have never seen ; but the description of it is not 

 sufficiently close to the spider now described to justify the 

 conclusion that the two are identical. The profile also is 

 much like that of W. erythropus, Westr. ; but the caput is 

 less elevated and the palpi totally unlike. It is also allied to, 

 but I think quite distinct from, fV. elegans^ Cambr., a Bava- 

 rian species (P. Z. S. 1872, p. 7G6, pi. Ixvi. fig. 23). 



Walchenaera nemoraUo'ideSj sp. n. 



Adult male, length ^V of an inch ; adult female yV of an 

 inch. 



In size and form, as well as in the coriaceous punctured upper 

 surface of the abdomen, this little spider closely resembles W. 

 nemoralisj Bl. ; but the colour of the cephalothorax and abdomen 

 is blacker and that of the legs is a clearer yellow than in that 

 species. The two may also be more readily distinguished by 

 the form of the radial joint of the palpi. The apophyses of 

 this joint are in a similar position, but the outer (tapering) 

 one is much larger, longer, and more prominent, being double 

 as long as the joint, slightly curved, projecting outwards at 

 right angles to it, and very slightly hooked at the point. The 

 other apophyses are very similar to those of W. nemoralis^ 

 but proportionately larger and of a different form, that in front 

 being constricted near the middle. 



In W. nemoralis the outer apophysis is not only shorter and 

 less strong, but consists apparently of two parts, a basal por- 

 tion, prolonged and ending Avith a very fine, sharp, somewhat 

 thorn-like addition. 



Examples of this spider have been sent to me at different 

 times during the last two years by Maj.-Gen. A. W. M. van 

 Hasselt from Holland. Mons. Simon, on examining one of 

 these which I forwarded to him, considered it to be only an 

 example of W. nemoralis, Bl. ; but the differences above 

 noted (as well as some other minor ones) are so constant that 

 I do not feel the smallest doubt of its being specifically 

 distinct. I have received also one example of the typical 

 W. nemoralis, B\., ^, from Holland; but the species now 

 described has not yet been found in Great Britain. 



The female resembles the male in colours, but the occiput 

 is simply a very little gibbous when seen in profile, and the 

 height of the clypeus is rather less than half that of the facial 

 space. 



