160 



wards, and is somewhat bifid at its termination. The palpal 

 organs are complex, and have a circularly coiled spine at their 

 extremity. 



I found both sexes of this spider in abundance on under- 

 wood at Bloxworth, in July, 1860, but since that time have never 

 met with a single example, although I have frequently searched 

 at the same season and in similar situations, in the same, and in 

 various other neighbouring localities. A very striking instance 

 of that uncertainty of occurrence, with which every entomologist 

 is so familiar in respect to many kinds of insects, and for which 

 any adequate reason has seldom ever yet been given. Mr. 

 Blackwall has met with Walckenaera flavipes, in Lancashire and 

 in North Wales. 



The female resembles the male in colours, but (like most others 

 of the group) omits the cephalic olovation. 



WALCKENAERA HIEMALIS. 



Walckenaera hiemalis, Blachw., Spid. Great Brit, and Irel. 

 p. 302, pi. xxi., fig. 217. 



The length of the male of this spider is 1-1 6th of an inch. 

 The caput is obtusely and distinctly but not greatly elevated ; the 

 summit of the elevation being divided longitudinally by a small 

 groove ; the fore part, just above the insertion of the falces, is 

 considerably prominent, and there is a strong longitudinal inden- 

 tation behind each lateral pair of eyes. The area enclosed by 

 the four pairs of eyes has numerous short hairs along the middle. 



The colour of the cephalo-thorax is deep blackish-brown ; the 

 legs are red-brown, and the abdomen black. 



The palpi are similar in colour to the legs, the radial joint, 

 however, being dark-brown, and stronger than the cubital ; the 

 former joint is greatly and broadly produced at its fore extremity 

 on the upper side, extending considerably over the base of the 

 digital joint ; the end of tho produced part is curved and directed 

 outwards, and near it is a curved, sharp-pointed spine, which 

 has also an outward direction. The palpal organs are wel 



