November, 191 3. The Irish Naturalist. 205 
CLUBIONA JUVENIS SIMON. 
A SPIDER NEW TO THE BRITISH ISLES RECENTLY FOUND 
IN IRELAND. 
BY A. RANDELL JACKSON. M.D. D.SC. 
AND DENIS R. PACK-BERESFORD, B.A., M.R.I. A. 
In June, 191 1, Mr Reynell Pack-Beresford collected a 
few spiders on the sandhills at Arklow, Co. Wicklow, amongst 
which we found three females belonging to the genus 
( lubiona, but of which the species was unknown to us. 
On submitting these specimens to Professor Kulczynski, of 
Cracow, he said that they were also unknown to him, but 
suggested that they might possibly be Clubiona juvenis 
Simon. In order to clear up this point it was necessary to 
try to get some adult males, and accordingly a further expedi- 
tion to Arklow, in which Mr. R. Pack-Beresford joined, was 
made this year on June 22nd with this object in view. 
After working for about an hour and a half amongst the 
sand-hills along the sea-shore, three males and some five 
or six females were captured, besides many immature 
specimens of various ages. They live in the densest parts 
of the tufts of grass on the sandhills, and run rapidly over 
the sand when distiu'bed. A few specimens of Clubiona 
neglecta Camb. were also taken at the same time and place. 
A comparison of these three males with M. Simon's 
description and Dr. de Lessert's figures made it quite 
clear that Professor Kulczynski' s surmise was correct, and 
that the spiders were referable to the species described 
by M. Simon as Clubiona juvenis. With this conclusion 
the Rev. O. P. Cambridge, who has examined a pair of the 
specimens, agrees. Our collecting was brought to an 
abrupt ending by the arrival on the scene of an employe 
of Messrs. Kynoch, who told us that we were on ground 
strictly forbidden to the public, as we were amongst the huts 
in which explosives are stored. Unfortunately the manager 
of the works could not be found on the moment, and the 
time at our disposal did not admit of a search being made 
for him, otherwise we should no doubt have been able to 
get permission to continue our investigations ; as it was, 
we had to be content with the results already attained. 
