Rev. 0. P. Cambridge on two new British Spiders. 173 



smaller, in the relative lengths of the spinnerets, and in having 

 the space between the six spots on the upper side of the abdo- 

 men dark brown, forming a long pointed-oval marking, reaching 

 to the vertex of the first angulated line. 



The adult male above described was taken by myself in April 

 1859, by raking with a crooked stick along the rooty ledges 

 in the sand-hills at Southport, Lancashire, on the north side of 

 the town. It was very active, and bit fiercely when seized. I 

 have since captured immature specimens among moss and grass 

 on the same sand-hills: and later still (in Oct. 1859), I found 

 both sexes, in a state of immaturity, plentiful under stones and 

 detached pieces of rock in the Isle of Portland, where they are 

 very difficult to capture, as they slip from the fingers and among 

 the stones like little eels. The immature female mentioned 

 above was captured by myself under a stone on Kirkby Moss, 

 near Liverpool, in June 1859. 



Family LINYPHIID^E. Genus WALCKENAERA. 

 Walckenaera aggeris. 



Length T ^- of an inch; breadth -fa. 



The distinguishing characteristics of this species seem to be, 

 the pale joints of the legs ; the boldness and obtuseness of the 

 frontal eminence ; the indentations behind the lateral pairs of 

 eyes ; the forehead clothed with hairs, and the form of the palpi 

 and palpal organs. 



The following is a more minute description : 



Cephalothorax large, black, and shining : frontal prominence 

 broad, bold, and obtuse, sloping slightly from the top towards the 

 falces ; an oblong vertical space between the front and back pairs 

 of eyes thickly clothed with hairs. It has no indentation in the 

 medial line, but has one directed backwards from each lateral 

 pair of eyes. In females, the cephalothorax is smaller and the 

 prominence less bold than in males. 



Eyes in four pairs, situated one on the top of the eminence, 

 another on the front below, and a pair on each side of it, form- 

 ing the four sides of a square. 



Legs moderately robust, thickly clothed with short hairs; 

 bright yellowish red-brown, much paler at the region of the 

 joints. 



Palpi and maxillae same colour as the legs; extremity of the 



radial and digital joints brownish black. The radial, which is 



stronger than the cubital joint, is produced at its extremity in 



front, and has a sharp projection on its outer side. Digital 



joint oval, with a small lobe near its extremity on the outer side. 



