Europe: France; (25): North, West-Central, and East Europe; (8): Sweden; Norway; Denmark; Germany; Hungary; Russia; (59).
North America: (8).
Porcellio dilatatus Brandt. [Plate XV.]
1833 Porcellio dilatatus Brandt and Ratzeburg (4), p. 78, pl. 12., fig. 6.
1840 Porcellio scaber Milne-Edwards (not Latreille) (46), p. 167.
1868 Porcellio dilatatus Bate and Westwood (1), p.
1898 Porcellio dilatatus Sars (59), p. 179, pl. LXXVII., fig. 2.
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 scaber 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): Berkhamsted; (Norman, 50): Headley, Surrey; Ventnor; (Stebbing in Norman, 49).