1913. Jackson & Beresford. — C/uhiojia juvcnis. 207 
wards. It seems almost absurd to describe it as a branch 
of the apophysis, but it appears to represent the similarly 
placed, but much better developed and differently shaped 
inferior branch seen in such species as C. lutescens 
Westr., C. terresiris Westr, and C. neglecta Camb. The 
palpal organs arc very characteristic, and are shown from 
below in figure 3. 
Epigyne. — Greyish yellow-brown except for two circular 
pigmented areas at the anterior end, which are yellower. 
They are in contact with one another in the middle line. 
On the outer side of each of these is a dark gibbous promi- 
nence more deeply pigmented than the rest of the vulva. 
These are best visible from the outer sides. Posteriorly 
the epigyne is prolonged backwards and has its posterior 
border truncated. Usually the truncated border shows 
an indentation in the middle. This, however, is very 
variable in depth, sometimes it is very marked, at others 
hardly discernible. The posterior part of the epigyne 
bears in the centre a deep depression of a somewhat straight 
sided oval shape. 
Cluhiona juvenis Simon is very distinct from all its 
British congeners. In size it most nearly resembles C. 
trivialis L. Koch, but is usually rather longer and narrower 
than that species. Most specimens have a more or less 
parallel-sided appearance. It is paler too than C. trivialis, 
being coloured more hke C. diversa Camb. The sexual 
organs of the female resemble those of the above-mentioned 
species, but differ in many details and are easily recognizable. 
The male palpi cannot possibly be confused with those of 
any British species. This is a handsome addition to the 
fauna of the British Isles ; it has occurred previously in 
France and Switzerland. 
EXPLANATION OF PLATE i. 
Clubiona juvenis, Simon. 
1. Right palpus of nmle from outer side. 
2. Right palpal tibia from abovc.^ 
3. Right palpus from beneath. 
4. Epigyne from below. 
In the above figures « represents the inferior branch of the tibial 
apophysis, and h a spine-like process at the apex. In slightly different 
positions the prominence c is much more marked. 
A 2 
