430 A HISTORY OF RECENT CRUSTACEA 



there may be mentioned Tenby, Yentnor, Tunbridge Wells, 

 and Cissbury Camp near Worthing. Probably the little 

 white slow-moving woodlouse finds its food in the for- 



o 



micarium, and pays for its board and lodging by act- 

 ing as a scavenger. The ants when disturbed leave 

 their guests to shift for themselves, and do not carry 

 them off along with their own helpless larvas. There 

 are two other species of the genus, one of them a cave- 

 dweller. 



Oniscus, Linnaeus, 1767, occupies now a humble and 

 limited position in the sub-order of the Isopoda, the whole 

 of which it at one time embraced. Oniscus asellus, aucto- 

 runi, is very common throughout Europe and in North 

 America. There seems no reason to relinquish the 

 specific name in favour of the later Oniscus murarius of 

 Cuvier. The other species found in Great Britain, Oniscus 

 fossor, Koch, is smaller, duller in colour, and more closely 

 tuberculate. Oniscus Simonii, Budde-Lund, occurs in the 

 South of France; Oniscus punctatus, G. M. Thomson, in 

 New Zealand. 



Philoscia, Latreille, 1804, to be pronounced Philoskia, 

 and meaning ' a lover of shade,' has a name which would 

 probably be appropriate to every genus in this sub-order. 

 Budde-Lund gives the description of twenty species, with 

 the names of three more. That which he describes as 

 Pliiloscia longicornis is in fact Philoscia Couchii, Kinahan, 

 a maritime species which he elsewhere supposes possibly 

 to belong to Ligidium. Besides inhabiting the coasts of 

 Devon and Cornwall, Philoscia Oouchii appears to be found 

 all round the Mediterranean. It runs fast and is very 

 shy. The body is smooth as in the rest of the genus, and 

 the integument is not very firm. Pliiloscia muscorum 

 (Scopoli) is very common in the South of England and in 

 many parts of Europe. Budde-Lund says that Leach was 

 mistaken in saying that it had been found in Sweden. 

 Philoscia pulescens (Dana) is found in New Zealand. 

 l^iiloscia pulcliella, Budde-Lund, is identified by Dollfus 

 with his own earlier described Pliiloscia elongata. Dollfus 

 also establishes Philoscia Corsica, 1888. inhabiting the 



