762 rev. o. p. Cambridge on [June 18, 



the outer side of the produced part of the radial joint also has a 

 blunt, angular, prominent point. The digital joint is not large ; the 

 palpal organs are rather complex, and have, among others, a strongish 

 but short curved black spine near their extremity on the outer side. 



The female resembled the male in the punctured thorax aud ster- 

 num, and in colours ; but the caput was less elevated ; and the only 

 example of this sex ( 2 ) examined was rather smaller, though adult. 



An adult male and female were received from Dr. L. Koch, by 

 whom they were found near Nuremberg, Bavaria. It is very nearly 

 allied to, but quite distinct from, Walckenaera latifrons (Cambr.). 



Erigone (Walckenaera) pr^egracilis, sp. n. (Plate LXVI. 

 fig. 19.) 



Male adult, length ^V of an inch. 



The whole of the fore part of this Spider (except the legs and 

 palpi) is of a dark greenish black-brown colour, the falces being 

 rather the palest and the sternum the darkest. The legs are rather 

 long (their relative length 4, 1, 2, 3), and far slenderer than usual 

 in this genus ; they are of a pale yellow colour, and are furnished 

 sparingly with short hairs ; the abdomen is black. 



The cephalothorax has the caput elevated ; the elevation is 

 (looked at in profile) sloping and flattish in front, and sloping but 

 rounded behind ; it is constricted on the sides, and has a deep 

 longitudinal groove or excavation running backwards from each 

 lateral pair of eyes and reaching to the occiput ; the clypeus is 

 rather prominent and rounded, and its height exceeds half that of 

 the facial space. 



The eyes are dark-coloured and difficult to be seen ; the hind 

 centrals are widish apart, and seated on the upper fore margin of 

 the cephalic eminence ; the fore centrals are the smallest and seated 

 on a strong tubercle ; those of each lateral pair are placed obliquely, 

 the fore one slightly below the straight line of the fore centrals. 



The palpi are slender: the cubital joint is short, but slightly 

 longer than the radial ; it is bent forwards (or downwards) and has 

 a minute prominent point beneath its base, when looked at in profile. 

 The fore extremity of the radial joint is produced into a long, rather 

 narrow apophysis, which reaches obliquely over the digital joint, 

 extending to half its length ; it is bifid at its extremity ; the outer 

 or lower limb of the bifid part is much the longest, the other limb 

 being a mere short, sharp, prominent point. From beneath the 

 outer side of the radial apophysis there issues a strong reddish- 

 coloured corneous process, whose somewhat pointed extremity curves 

 upwards by the side of the bifid extremity of the apophysis ; the 

 radial joint is also slightly gibbous in front, towards the outer side ; 

 and the gibbous portion is furnished with a group of a few longish 

 coarse hairs. The palpal organs are complex and prominent, and 

 have a double, circularly curved, strongish black spine near their 

 extremity. 



The sternum is convex, but has a large, shallow, circular indenta- 

 tion forwards : possibly this may have been the result of injury. 



