THE BRITISH WOODLICE. 35 
Some specimens found by Mr. Webb in 1899 at Eton were 
submitted to Mr. Stebbing, and since then the former has 
found ‘Porcellio vathkei 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 scabev 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). FIGs SO==ELAGECLUM 
North America : (59). AND LAST PEDUNCULAR 
JOINT OF THE ANTENNA 
Porcellio laevis Latreille. PrLatre XVII. oF Porcellio rathket. 
fy 
A 
Ait 
Ve 
FIG, 5I.— FLAGELLUM 
AND LAST PEDUNCULAR 
JOINT OF THE ANTENNA 
oF Porcellio laevis. 
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 poeyt Guérin (30), 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 sumichtaslti Saussure (60), p. 307. 
1857 Porcellio cotille Saussure (60), p. 307. 
1857 Porcellio aztecus Saussure (60), p. 307. 
1857 Forcellio mexitcanus Saussure (60), p. 307. 
Another smooth species is Povrcellio 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. vathkei) 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. 
