34. THE BRITISH WOODLICE. 
The fact that Porcellio dilatatus is more than half as broad 
as it is long, at once distinguishes it from the other species of 
Porcellio. It is tuberculated and of somewhat 
a lighter grey than Porcellio scabey usually is. 
The two species agree in having the two joints 
of the flagellum equal, but the last peduncular 
joint, as in Porcellio pictus, is longer than the 
flagellum. 
As in the two preceding species, air-tubes 
are found in the outer plates of the appendages 
on the first two abdominal segments. Porcellio 
dilatatus is to be looked for near ‘houses. 
BRITISH LOCALITIES :— 
England: Maldon; (W.M.W. from R.M.): 
Eton; (Stebbing from W.M.W., 71a): Berk- 
hamsted ; (Norman, 50): Headley, Surrey ; 
no ebabonGueak Wentnor; (Stebbing in Norman, 49). 
soe relly GOEL ea: Iveland : Dublin ; (Scharff, 63): Dundrum ; 
(Scharffin Norman, 50): Galway ; Roundstone ; 
(R.F.S.): Belfast ; (C. W. Buckle, Irish Nat., Vol. XI. (1902), 
P- 43)- 
FOREIGN DISTRIBUTION :— 
Europe : France; (25) : Spain; (12) ; Denmark ; Norway ; Germany ; Poland ; 
Holland; (59). 
Africa : Madeira ; Azores; (24). 
Australia: New Guinea; (59). 
Porcellio rathkei Brandt. Priate XVI. 
1833 Porcellio rathkei Brandt (3), p. 177, fig. 10. 
1833 Porcellio ferrugineus Brandt (3), p. 178. 
1840 Porcellio trilineatus Koch (34), part 34, pl. IX. 
1853 Porcellio trivittatus Lereboullet (39), p. 54, pl. I., figs. 13 and 14. 
1853 Porcellio tetramoerus Schnitzler (65), p. 24. 
1853 Porcellio striatus Schnitzler (65), p. 24. 
There is often a light band down the back and one on either 
side of it near the margin in Porcellio vathket (especially in the 
males), with other more irregularly arranged light patches 
between. Unlike the three species previously considered, the 
present one hasa smooth body. The distal joint of the flagellum 
is the longer, and the flagellum itself is equal in length to the 
last joint of the peduncle. 
