PLATYARTHRUS HOFFMANNSEGGII. 465 
immersed in the first segment of the body, and very 
scabrous; the lateral lobes are much developed. The 
antenne are scabrous, as are also the segments of the 
body, the epimeral base of the legs forming the lateral 
margins of the segments, with the posterior angles 
directed downwards; the same part in the intermediate 
rings of the tail are also well developed; the terminal 
segment is triangular, emarginate on each side, with a 
shallow pit on its upper surface, its posterior margin 
tuberculated, as are also the posterior appendages 
(uropoda). 
The species was first noticed as British by the Rev. 
A. R. Hogan, M.A., who found it in ants’ nests at 
Lulworth Cove, near Weymouth, where he observed it 
in as many as thirty nests of the common red, yellow, 
and black ants, whilst about twice that number of nests 
in the neighbourhood were not found to be frequented 
by it. Previous to Mr. Hogan’s discovery we had 
noticed the occurrence of these white Oniscide in the 
nests of the common brown garden ant at Hammer- 
smith, but thought they were merely the young of some 
species of Porcellio. Since that time Mr. F. Smith has 
also found the species in the neighbourhood of London, 
and we have also again met with it in ants’ nests in the 
neighbourhood of Stow Wood, near Oxford, in the early 
summer months, as also at Berry Head, near Torquay, 
where they were found by Master M°Guire Bate; and 
near Plymouth, taken by Mr. Brooking Rowe. 
VOL, Ii. ye! 
