438 Rev. O. P. Cambridge on new Species of Spiders 



colour; relative length 4, 1^ 2, 3. Each tarsus ends with three 

 claws. 



Palpi short, same colour as the legs, except the digital joint, 

 which has a brown tinge ; radial joint larger than the cubital, 

 and with two projections at its extremity — a long, bifid, hairy, 

 obliquely curved one in fi'oiit of the digital joint, and a short 

 blunt one underneath it; digital joint short-oval, convex and 

 hairy outside, and with a lobe on the outer side near the base : 

 palpal organs very highly developed, prominent^ and complicated 

 in structure ; they are of a dark reddish-brown colour, and have 

 a black filiform spine at their extremity on the outer side; this 

 spine is curved into a circular form, and is enveloped in mem- 

 brane. 



Falces conical, divergent at their extremity ; a few teeth on 

 the inner surface, and inclined towards the sternum. 



MaxillcE short, and strongly inclined to the labium. 



Labium semicircular, prominent at the top, and with the 

 maxillse and falces of a brownish red, palest at the base of the 

 labium. 



Sternum heart-shaped, convex, dark brown, tinged with red. 



Abdomen oviform, sparingly furnished with hairs, projecting 

 slightly over the base of the cephalothorax ; colour brownish 

 black ; branchial opercula and spinners yellowish white. 



Five adult males of this species were discovered by myself on 

 underwood at Lyndhurst, New Forest, at the end of May 1860. 



It is closely allied and similar in general appearance to 

 Walckenaera cuspidata (Blackwall, Edinburgh Phil. Mag. iii. 

 p. 257), though not quite so large nor so richly coloured : one chief 

 difference seems to be the form of the vertical projection on the 

 frontal eminence, which, in W. unicornis, has no hairs at the top 

 (where it is enlarged and notched) and is paler-coloured and more 

 vertical; while in W. cuspidata it is more projecting forwards, 

 jet-black, and crowned with hairs. The position of the eyes also 

 differs from that of JV. cuspidata, the hinder row being more 

 strongly curved, and so separating the two centre pairs of eyes 

 more than in that species. 



It is also allied to Walckenaera monoceros, but differs from 

 it not only in the points mentioned above, but in colour and 

 general appearance, though resembling it more in the position 

 of the eyes than it does W. cuspidata. 



Walckenaera ludicra. 



Size very small ; colour nearly uniform pale murky ochre-yellow ; 

 frontal eminence very large, shaped like the hood of a cabriolet, 

 and greatly inclined backwards, so that in most adult male spe- 



