PORCELLIO PRU1NOSUS. 



ISOPODA. 



NORM All A. 



487 



ON/SCIDJE. 



PORCELLIO PRUINOSUS. 



Specific character. Subovate, oblong, slightly rugose, and downy. Lateral 

 lobes of the front of the cephalon small and rounded. Central lobe minute, 

 almost linear. Pleon narrow, with the terminal segment triangular, acute at 

 the apex. Pereiopoda long. 



Length, about one-third of an inch. 



Porcellio pruinosus. BRANDT, Conspectus Mon. Onisc. Bull. Mosc. vi. p. 181. 



KINAHAN, Dublin Nat. Hist. Rev. vol. iv. 1857, 



p. 278, pi. 19, figs. 3, 5, 7, pi. xxi. fig. 1. 

 Porcellio frontalis. LEREBOULLET, Mem. Soc. Hist. Nat. Strasbourg, iv. 



1853 (not of MILNE EDWARDS). JOHNSSON, Syn. 



Framst. Sver. Onisc. p. 30. 

 (Var.?) P.maculicornis. KOCH, Cont. Panz. Heft. 180, n. 16. BUKGERSDIJK, 



Annot. p. 48. 



THIS species, although one of the commonest of our 

 British wood-lice, was first detected by the late Professor 



