190 Proceedings of the Royal Irish Academy. 



DESCRIPTION OF PLATE VIII. 



Fig. 



1. The dorsal surface of a Woodlouse — diagrammatic, giving the names of the 



various parts most commonly referred to in the tables for distinguish- 

 ing the various genera and species. 



2. Pace view of head of Woodlouse — diagrammatic. 



3. Metoponorthus melanurus Budde-Lund. A dorsal view ; the darker meta- 



some is very characteristic in this species. 



4. Muma purpurascens Budde-Lund. 



A. Dorsal view. 



B. Side view. The groove along the first lateral plate and the 



indentation at its posterior angle are shown. 



