Pack Beresford AND Foster — The Woodlice of Ireland. 179 



Porcellio pictus Brandt. 



Porcellio dilatatus Bi;indt. 





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This species affects a much drier 

 habitat than ohtains with Woodlice in 

 general in this country, being often 

 found in the crevices of garden walls 

 facing south, than which hotter and 

 drier situations can hardly be found. 

 It not unfrequently makes its way, too, 

 into dwelling-houses, even invading 

 beds. 



It seems not unlikely that this 

 peculiarity may account for its being 

 often overlooked ; for, until a year or 

 two ago, it was considered to be one of 

 our rarest species. We hare now 

 received it from or taken it oui'selves 

 in many parts of Ireland ; but though 

 it seems to be widely distributed, it 

 does not seem to be numerous any- 

 where. One collector, however (S. A. G), 

 sending us numerous specimens from 

 Loughgilly, Co. Armagh, says that it 

 appears to be the commonest species in 

 that neighbourhood. It has been re- 

 corded from only a few places in Eng- 

 land and Scotland; but ou the Continent 

 it seems to range over the whole of 

 the north and centre of Europe, and it 

 has also occurred in N. America. This 

 species is called P. spinicornis Sav in 

 Miss Eichardson's monograph on Ameri- 

 can Isopods. 



In Porcellio dilatatus we liave a 

 species about which it is difficult to say 

 with certainty whether it is really 

 native or not. It occurs througbout 

 Europe generally, however, in or near 

 houses or in cellars. 



It is found in similar situations in 

 this country ; but we find it more 

 commonly in greenhouses and conser- 

 vatories, where it is often numerous. 

 In warm greenhouses we have found 

 specimens of very light colour due 

 apparently to a superficial bloom like 

 that of Metoponorthus pruinosiis. AVe 

 have also a few records of its oc- 

 currence in the open country, as at 

 Ventry Bay (R. W. and A. W. S.) and 

 Valencia Island (M. J. B.), S. Kerry ; 

 Dog's bay, W. Galway (R. V.) ; Kil- 

 lala, W. Mayo [N. H. F.) ; Lough Erne, 

 Co. Fermanagli (E. P.) : Bundoran, 

 E. Donegal (N. H. E.) ; and Coney 

 Island, Lough Neagh, Co. Armagh 

 (R. "W.). It has been recorded from 

 only about five localities in the south 

 of England, whilst on the Continent it 

 has been found in France, Spain, 

 Holland, Germany, and Denmark, 

 ranging north into i^orway. Outside 

 Europe it occurs in Madeira, the 

 Azores, and Australia. 



