32 THE BRITISH WOODLICE. 
Genus—PORCELLIO Latreille, 1804 (37), p. 45. 
Flagellum, with two joints ; abdomen, broad ; frontal lobe projecting. 
Porcellio is easily separated from the previous genera—Onmiscus, 
Philoscia, and Platyarthvus—by its two-jointed flagellum. The 
fact that the abdomen is not abruptly narrowed separates it 
from Metoponorthus, 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 iobe is very small, and 
the first segment of its thorax is comparatively larger than in any 
species of Porcellio. 
Porcellio scaber Latreille. PiLate XIII. 
1804 Porcellio scaber Latreille (37), p. 45. 
1818 Oniscus granulatus Lamark (36), p. 261. 
1818 Porcellio nigra Say (62), p. 432. 
1840 Porcellio brandtit Milne-Edwardes (46), p. 168. 
1840 Porcellio dubius Koch (34), part 34, pl, VIII. 
1847 Porcellio asper Koch (35), p. 207, pl. VIIL., fig. 98. 
1857. Porcellio montezumx Saussure (60), p. 207. 
1865 Porcellio paulensis Heller (31), p. 136, p. XIL., fig. 5. 
1868 Porcellio scaber Bate and Westwood (a); Dp: 475. 
1876 Porcellio graniger Miers (44), Pp. 223. 
1885 Porcellio graniger Budde-Lund (8), p. 149. 
1898 Porcellio scaber Sars (59), Pp. 176, pl. LXXVII. 
The body of Porcellio scabey 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). 
Iveland : Common everywhere ; (Scharff, 63.) 
FIG. 47. FLAGELLUM : 
ANDLAST PEDUNCULAR FOREIGN DISTRIBUTION :— 
JOINTIOR THEVANTENNA Europe : Throughout ; (59): France; (28): Spain; (15): 
oF Porcellio scaber. = Be 
Iceland; (59): Faroe Isles—Thorsham and Naalsoe— 
(R.F.S. and B,M., N. Annadale). 
