Ireland: Dublin; (Scharff, 63): Dundrum; (Scharff in 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. [Plate 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 rathkei (especially in the males), with other more irregularly arranged light patches between. Unlike the three species previously considered, the present one has a 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.
Some specimens found by Mr. Webb in 1899 at Eton were submitted to Mr. Stebbing, and since then the former has found Porcellio rathkei to be pretty generally distributed in West Middlesex, where the species appears to frequent the open fields.