PLATYARTHRUS HOFFMANNSEGGII. 465 



immersed in the first segment of the body, and very 

 scabrous ; the lateral lobes are much developed. The 

 antennae are scabrous, as are also the segments of the 

 body, tlie 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 Oniscidcs 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. H H 



