1872.] NEW SPECIES OF ERTGONE. 767 



Erigone (Walckenaera) alpina, sp.n. (Plate LXVI. fig. 24.) 



Male adult, length y T of an inch. 



This species, which has the fore part of the cephalothorax divided 

 into two segments, is allied to TV. cristata (Bl.) and W. latifrons 

 (Cambr.) ; but it may be easily distinguished by its larger size and 

 the much larger proportion that the hinder segment of the cephalic 

 eminence bears to the fore one. In this respect there is a great re- 

 semblance to Erigone cucullata (Koch) ; from this, however, it is 

 easy to separate it, as the hinder segment in E. cucullata projects 

 far more forwards than that in the present species. 



The colour of the cephalothorax is dark yellow-brown, that of 

 the abdomen (which is large, oval, and very convex above) being of 

 a dull black colour, clothed with hairs. The legs and palpi are 

 pale yellow, except the radial and digital joints of the latter, which 

 are dark brown. 



The hinder segment of the caput is large and rounded at its 

 summit, the occipital line (in profile) a little sloping, the frontal line 

 more vertical ; the fore segment is not one third as strong as the 

 hinder one, and it is a little prominent ; its summit, as well as the 

 upper fore margin of the hinder segment, is furnished thickly with 

 strong hairs, which meet over the cleft between the two segments ; 

 this cleft is (when looked at in profile) equal in width to the breadth 

 of the fore segment, but is wider at the top than at the base. 



The eyes are placed in the usual four pairs : those of one pair, ou 

 the summit of the hinder segment, are wide apart ; those of another 

 pair, on the upper fore margin of the foremost segment, are dark- 

 coloured and difficult to see ; those of each lateral pair are contiguous 

 to each other, and seated just below the base of the cleft on either 

 side ; behind each lateral pair is a large, longitudinal, somewhat 

 oval excavation ; and at its larger end (near the eyes) is a circular 

 shining pit or depression. 



The palpi are of ordinary length and strength : the cubital joint 

 curves forwards ; it is long and much enlarged (or clavate) at its 

 fore extremity, near which, on the upperside, is a short, strong, black 

 bristle ; the radial joint is short, prominent behind, and produced 

 in front into a large somewhat oblong apophysis with a sharply 

 curved corneous-looking point issuing from its inner extremity and 

 reaching to its outer one, between which and the base of this curved 

 point is a somewhat circular excavation or emargination ; this 

 apophysis covers a considerable portion of the outer surface of the 

 digital joint ; and the outer surface of the two digitals are turned 

 towards each other : the palpal organs are prominent and complex, 

 with corneous spines, processes, and transparent membrane. 



The falces are equal in length to the height of the clypeus ; they 

 are strong, straight, and with some fine teeth towards their extremi- 

 ties on the inner sides. 



A single example of this Spider was found by myself high up on 

 one of the mountains near Bruck-am-Muir, in Styria, in June 1865; 

 and I have since received another for examination from Dr. Ludwig 



