198 REV. 0. P. CAMBRIDGE ON [ Mar. 16, 
The abdomen is of moderate size, not very convex above, but 
projects over the base of the cephalothorax; it is clothed very 
sparingly with short hairs. and is of a jet-black colour. 
The curved spine on the forehead and those on the radial joints of 
the palpi are very characteristic, and will readily distinguish this 
Spider from all other known species of this group of the genus 
Erigone. 
A single example was received from M. Eugéne Simon, by whom 
it was found with others on the Col des Ayes, Casset, in the French 
alpine regions. 
ERIGONE VAPORARIORUM, Sp. n. (Plate XXVII. fig. 8.) 
Adult male, length 1 line. 
The colour of the cephalothorax, falces, maxille, labium, and 
sternum is a deep rich brown, the latter nearly black ; that of the 
legs is reddish orange-yellow; the palpi are yellow tinged with 
brown ; the radial and digital joints dark brown, and the abdomen 
black. 
The cephalothorax is prominent in front, but not elevated, the 
fore part of the caput being broad, obtuse, and projecting forwards ; 
there is a rather strong, but shallow, transverse impression immedi- 
ately behind the ocular area, while the occiput is full and rounded ; 
the surface is glossy, and the ocular area is furnished pretty thiekly 
with hairs directed backwards ; the clypeus retreats strongly, and its 
height equals half that of the facial space. 
The eyes are in four pairs, and present a rather unusual figure, 
forming a rectangle on the flattish surface of the fore part of the 
caput; this figure is caused by the unusually wide separation of 
the eyes of the hinder pair, these, which are slightly the largest of 
the eight, being divided by an interval almost equal to that between 
the fore lateral eyes; those of the foremost pair are very small, 
dark-coloured, and inconspicuous, and near, but not contiguous 
to each other; those of each lateral pair are contiguous, and have 
the slightest possible oblique direction, each being almost in a line 
with the eye of the hinder pair on its side. 
The /egs are moderate in length and strength; their relative 
length is 4, 1, 2, 3; they are furnished with hairs and a very few 
slender prominent bristles. 
The palpi are moderately long and strong: the cubital joint is 
rather clavate and bent downwards: the radial joint is short, but 
has its fore extremity on the upperside prcduced into a large 
apophysis, covering the greater part of the digital joint, and directed 
inwards ; the extremity of this apophysis is bifid, the upper, or 
outer corner being produced into a strong, roundly clavate, promi- 
nent projection, curving outwards and upwards, while the inner, or 
lower, corner is produced into a curved, tapering, sharp-pointed one ; 
this clavate projection makes the length of the radial apophysis 
almost equal to that of the digital joint; this joint is rather large, 
and of an oval form: the palpal organs are highly developed, pro- 
minent, and complex ; among the corneous processes of which they 
