Arachnida, 



8591 



two principal lobes : towards their extremity there are two 

 spines — one, long, strong, corneous and black, issues from their 

 extremity on the under side, curves round their extremity, and 

 so on round the outer margin of the digital joint, across their 

 base, and projects outwards in a long filiform point ; the other 

 spine is short and stout, and springs from within the coil 

 formed by the other spine, within which it lies, curved round in 

 an opposite direction. 

 Abdomen jet-black, sparingly clothed with very short hairs, ovi- 

 form, very convex above, and projecting over the base of the 

 cephalothorax. The plates of the spiracles have a greenish 

 hue. 



An adult female, captured with the male, differed in being gene- 

 rally lighter coloured, the cephalothorax being less prominent and 

 obtuse, and without the eminence, characteristic of the male spiders 

 only, of this genus. 



This very distinct species was captured by myself on iron railings 

 at Bloxworth, in May, 1862. The shape, and position of the cepha- 

 lothorax and its frontal eminence (forming, in fact, three frontal mar- 

 gins) are very characteristic, as also are the radial and digital joints 

 of the palpi, and the spines connected with the palpal organs. 



Walckenaera affinitata. 



Male, adult. Length 1-fifteenth of an inch. Length of cephalo- 

 thorax 1-thirtieth. Relative length of legs, 4, 1, 2, 3. 



Cephalothorax dark brown, much elevated and rather prominent, 

 broad and obtuse in the ocular region, which is truncated in a 

 sharply sloping direction from the top forwards, and thence 

 downwards, with a slight inward curve, to the frontal margin : 

 the slope of the hinder part of the ocular region is in a rather 

 convexly curved line, and joins almost in the same line as the 

 slope of the hinder part of the cephalothorax. 



Eyes in four pairs, on the summit and front slope of the ocular 

 region. Those of the two side pairs are contiguous and equal 

 in size, and the smallest of the eight. Those of the front pair 

 are slightly below the straight line of the foremost eyes of the 

 side pairs, and are near together, but not contiguous ; around 

 them are some short bristly hairs. The eyes of the hinder pair 

 are the same distance from each other as each is from the 

 hinder one of the side pair on its side. 



