27 



Oniscus asellus Lin. 



Without doubt our commonest species, occurring every- 

 where. The "butter-scotch" variety occurs frequently, particularly 

 in the western portion of the district, and on the shore at 

 Bundoran several specimens of a pea-green colour have been 

 taken. 



Porcellio scaber Latreille. 



This species occurs abundantly in every district — large 

 colonies being often found beneath the decaying bark of trees. 

 Under stones above high tide mark on the shore it exists in large 

 numbers. It is subject to great variation in colour. Usually of a 

 dark leaden-grey colour — almost black — it is often found with 

 red, orange or yellow side-plates, whilst (particularly in immature 

 specimens) the ground colour may be tawny or fawn, more or less 

 speckled and streaked with dark brown. At Torr Head a bright 

 blue specimen was obtained from a large colony of normally 

 coloured individuals under a large stone on the beach. 



Porcellio pictus Brandt. 



Though as yet only recorded from eight of our County 

 Divisions it is probable that this species is distributed throughout 

 Ulster. It is usually found in very small numbers, and, as it 

 affects drier situations than other species, it is often found in 

 dwelling-houses. A correspondent sending collections from 

 Loughgilly, Co. Armagh, says that there it appears to be the 

 common woodlouse of the district. The following are the 

 recorded Ulster localities : — Near Cavan Town, Cavan ; Camla 

 House, Monaghan ; Castle Archdall, Fermanagh ; Gortin and 

 Coalisland, Tyrone ; Loughgilly, Navan Fort and Loughgall, 

 Armagh; Hillsborough, Bangor, Killough and Ballymagee, Down; 

 and Belfast, Ballycastle, Fair Head, Ballintoy, Selshan and 

 Templepatrick, Antrim. 



