94 



THE BRITISH W00DL1CE. 



Genus— PORCELLIO Latreille, 1804(37), p. 45. 

 Flagellum, with two joints ; abdomen, broad; frontal lobe projecting. 



Porcellio is easily separated from the previous genera — Oniscus, 

 Philoscia, and Platyarthrus— by its two-jointed flagellum. The 

 fact that the abdomen is not abruptly narrowed separates it 

 from Metoponorthns, which also lacks the prominent frontal lobe 

 so characteristic of Porcellio. The species of this genera might 

 be confused with Cyclisticus which has two joints to the flagellum 

 and a broad abdomen, but the latter genus has the power of 

 rolling itself into a ball, while its frontal lobe is very small, and 

 the first segment of its thorax is comparatively larger than in any 

 species of Porcellio. 



Porcellio scaber Latreille. Plate XIII. 



1804 Porcellio scaber Latreille (37), p. 45. 



1818 Oniscus granvlatus Lamark(36), p. 261. 



1818 Porcellio nigra Say (62), p. 432. 



1840 Porcellio brandtii Milne-Edwardes (46), p. 168. 



1840 Porcellio (labia* Koch (34), part 34, pi. VIII. 



1847 Porcellio asper Koch (35), p. 207, pi. VIII. , fig. 98. 



1857 Porcellio montezumse Saussure (60), p. 207. 



1865 Porcellio paulensis Heller (31), p. 136. p. XII.. fig. 5. 



186S Porcellio scaber Bate and Westwood (1), p. 



1876 Porcellio graniger Miers (44). p. 223. 



1885 Porcellio graniger Budde-Lund (8), p. 149. 



1S9S Porcellio scaber Sars (^g), p. 176, pi. LXXVII. 



The body of Porcellio scaber is densely covered with tubercles. 

 Its colour is usually of a very dark grey, but at times it is quite 

 red or variegated with yellow. Albino speci- 

 mens have been recorded. The two joints 

 of the flagellum are of the same length and 

 together equal that of the last joint of the 

 peduncle. Air-tubes are present in the outer 

 plates of the first two abdominal appendages. 



BRITISH LOCALITIES :- 



England: High Beach, Epping ; Warley ; 

 Brightlingsea ; (W.M.W.): Maldon ; (W.M.W. 

 from R.M.) : Langley ; Kew ; Skirmett ; Pamber 

 Forest; (W.M.W.) : Liphook ; (C.S.) : Stoke- 

 on-Trent; Kingston-on-Soar ; (W.M.W.) 



Scotland : Dinnet (W.M.W. from Madame 

 Christen. 



Ireland : Common everywhere ; (Scharff, 63.) 



FOXEIGN DIS TRIE- UTION : - 

 Entope : Throughout ; (59) : France; (28) : Spain ; (15) : 

 Iceland ; (59) : Faroe Isles— Thorsharn and Naalsoe — 

 (R.F.S. and B.M., N. Annadale). 



FIG. 47. —FLAGELLUM 

 ANDLAST PEDUNCULAR 

 JOINT OF THE ANTENNA 



of Porcellio sccLber. 



