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 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 DISTRIB UTION :— 



Europe : France ; (25): Bosnia; Servia ; (22); Hertzo- 

 govauia (B.M.) ; Norway ; Northern, Western, and Middle 

 Europe, everywhere; (59) : Corfu (B.M.) 



Asia • Transcaucasia ; (59). 



North America : (59). 



Porcellio laevis Latreille. Plate XVII. 



FIG. 50. — FLAGELLUM 

 AND LAST PEDUNCULAR 

 JOINT OF THE ANTF.NNA 



of Porcellio rathkei. 



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 Gnei in (30), p. 6. 



1844 Porcellio urb'icus Koch (34), part 36, pi. IV. 



1847 Porcellio Jiavipes Koch (35), p. 206, pi. VIII. , fig. 97. 



1853 Cylisticus laevis Schnitzler (65), p. 25. 



1857 Porcellio cubensis Saussure (60). p. 307. 



1857 Porcellio siimichtasii Saussure (60), p. 307. 



1857 Porcellio cotillx Saussure (60), p. 307. 



1857 Porcellio aztecus Saussure (6o>, 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 

 joint ofthe antenna s ]ip;htlv the longer and as in the last species 



of Porcellio laevis. b J & . 



(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. 



fig. 51.— flagellum 

 and last peduncular 



