THE BRITISH WOODLICE. 97
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.
Air-tubes occur in abdominal appendages
1 to 5 and the white appearance of all of these
at once serves to distinguish the living animal
from Porcellio scaber in which the first two pairs
of abdominal appendages alone are white.
BRITISH LOCALITIES : —
England: Eton ; (Stebbing, 71a) : Lane End ;
(Stebbing, from the Misses Johnston, 71a):
Acton ; Ealing ; Hanwell; Southall ; Northolt ;
Greenford; West Drayton; Mortlake; (W.M.W.):
Sunderland; (Brady, 50a).
FOREIGN DISTRIBUTION:—
Europe: France; (25): Bosnia; Servia; (22); Hertzo-
govania (B.M.) ; Norway ; Northern, Western, and Middle
Europe, everywhere; (59) : Corfu (B.M.)
Asia: Transcaucasia; (59).
North America : (59).
Porcellio laevis Latreille. Plate XVII.
1804 Porcellio laevis Latreille (37), p, 46.
1827 Porcellio degeerii Savigny and Audouin (61), p. 289.
1833 Porcellio cucercus Brandt (3). p. 177.
1833 Porcellio syriacus Brandt (3), p 178.
1833 Porcellio musculus Brandt (3), p. 180.
1833 Porcellio cinerascens Brandt (3), p. 178.
1833 Porcellio dubius Brandt (3), p. 178.
1837 Porcellio poeyi Guerin (go), p. 6.
1844 Porcellio urbicus Koch (34), part 36, pl. IV.
1847 Porcellio flavipes Koch (35), p. 206, pl. VIII., fig, 97.
1853 Cylisticus laevis Schnitzler (65), p. 25.
1857 Porcellio cubensis Saussure (60), p. 307.
1857 Porcellio sumichtasli Saussure (60), p. 307.
1857 Porcellio cedilla: Saussure (60), p. 307.
1857 Porcellio aztecus Saussure (60), p. 307.
1857 Porcellio mexicanus Saussure (60), p. 307.
Another smooth species is Porcellio laevis.
The colour of its body is light grey with
irregular white markings. The large size of
this species and the very long tail-appendages
of the males are features which will help to
identify it. The distal joint of the flagellum is
slightly the longer and as in the last species
(P. rathkei) the flagellum is equal in length to
the last joint of the peduncle. The chief habitats for this species
are among vegetable rubbish near human dwellings.
Only the first two abdominal appendages contain air-tubes.