490  ONISCIDA, 
from P. pruinosus, in company with which it is often 
found, and of which it might be mistaken for the young, 
which latter, however, do not differ from their parents. 
The basal portion of each of the segments of the body 
is marked with a transverse raised line, whence the name 
given by Professor Kinahan to the species. It is of a 
dark steel colour, with red and yellow spots. It runs 
with very great rapidity, and never rolls itself into a 
ball, as might indeed be surmised from the small develop- 
ment of the lobes of the head, which form, in other 
species, the defence of the antennz when at rest. 
It is very rare. Specimens taken near Dublin by 
Professor Kinahan, are in the collection of the British 
Museum and our own cabinet. 
