1872.] NEW SPECIES OF ERIGONE. 765 



is of moderate size and ordinary form ; the palpal organs are promi- 

 nent and complex, with a small, slender, coiled black spine at their 

 extremity. The falces are small, straight, and a little inclined back- 

 wards to the maxillae, which, together with the labium and sternum, 

 are of ordiuary character. 



The female resembles the male in colour, but is larger and devoid 

 of the elevation of the caput ; the form of the genital aperture is 

 characteristic, but easier to be seen in the figure than to be made 

 out from a description. 



An adult example of each sex was received for examination from 

 Dr. Koch, by whom they were captured near Nuremberg. It is 

 allied to Walckenaera nemoralis (Bl.), W. implana (Cambr.), and 

 Erigone blackwallii (Cambr.), but may easily be distinguished by 

 the form and structure of the palpi and other characters. 



Erigone (Walckenaera) blackwallii, sp. n. (Plate LXVI. 

 fig. 22.) 



Male adult, length f of a line. 



The cephalothorax, which is smooth and glossy, is large and 

 elevated in front, rather flattened behind, and impressed laterally 

 behind the lateral pairs of eyes ; clypeus bluff and rounded, and its 

 height is equal to (if it does not exceed) half that of the facial space ; 

 the space between the fore and hind central pairs of eyes is im- 

 pressed, when looked at in profile ; and the lower part of this space is 

 clothed with hairs. The eyes are in the ordinary position ; and im- 

 mediately behind and above each lateral pair is a strong, somewhat 

 circular pit or indentation. The general area occupied by the eyes 

 is broader than long ; i. e. the interval between the foremost eyes of 

 the lateral pairs is greater than that between each of these and that 

 of the upper pair on its side. The falces are not very large ; they are 

 placed considerably back, beneath the clypeus, and are inclined to- 

 wards the sternum. The colour of the cephalothorax and falces is 

 dark brown, with a yellowish tinge. Legs dull orange-yellow, 

 rather short and moderately strong, furnished with hairs only. 

 Palpi moderately long, strong, similar in colour to the legs, except 

 the digital joint, which is deep brown. The cubital joint is much 

 stronger than the radial ; this last is very short, and has its inner 

 extremity prolonged into a longish, slightly tapering, pointed, curved 

 apophysis, the point directed outwards ; on the outer extremity, 

 towards the underside, is another, small, sharp-pointed, corneous 

 apophysis, its extreme point being bent outwards. The digital 

 joint is large and of an oval form ; the palpal organs are well de- 

 veloped, but not very complex, with several corneous prominences 

 and spines, a small circularly curved one of which latter is at their 

 fore extremity. The abdomen is large, somewhat flattened, and 

 projects considerably over the base of the cephalothorax ; the greater 

 part of its upperside is covered by a sort of coriaceous shield or 

 separate integument similar to that in W. nemoralis (Bl.), to which 

 species it is nearly allied ; this shield is covered with minute punc- 

 tures ; four more conspicuous punctures form a quadrangle on the 



