TWO RARE WOODLICE IN SCOTLAND 137 



SOME REMARKS UPON THE OCCURRENCE OF 

 TWO RARE WOODLICE IN SCOTLAND 



By Walter E. Collinge, D.Sc, F.L.S., Carnegie Fellow, and 

 Research Fellow of the University of St Andrews. 



My appeal for specimens of the woodlice of Scotland {Scot. 

 Nat., 191 6, p. 120) has brought me very many new records 

 from all parts of the country, which have added considerably 

 to our knowledge of the distribution of these Crustacea ; but 

 it is only during the past month that I have received any 

 species hitherto not known to occur in Scotland, or that may 

 be regarded as uncommon. 



In a recent collection, forwarded by Miss AL. J. Jardine, 

 to whom my best thanks are due, I find examples of Porcellio 

 rathkii, Brandt, and a single specimen of HaplophtJialmus 

 danicus, Budde-Lund. Both species were obtained in a 

 garden at Helensburgh, Dumbartonshire. 



The former species has been recorded from a large 

 number of English localities, but this is the first record of its 

 occurrence in Scotland, whilst the latter species has been 

 recorded from the counties of Ayrshire and Lanarkshire. 



In company with these two species there were numerous 

 examples of Trichoniscus pusillus, Brandt, and the beautiful 

 variety violaceus, Schobl, T. roseus (Koch), Oniscus asellus, 

 Linn., Cylisticus couvexus (De Geer), Porcellio scaber var. 

 marmoratus, Brandt, P. pictus, Br., and very fine examples of 

 its variety aureomaculatus, Cllge. 



As there is no reason to suppose that either Porcellio 

 rathkii or HaplophtJialmus danicus are less common in 

 Scotland than in England, I propose to offer a few remarks 

 upon the distinguishing characters of each. 



Porcellio rathkii, Brandt. This species, especially in 

 female specimens, is subject to a wide range of colour varia- 

 tions and also in the extent to which it is tuberculated. 

 Webb and Sillem 1 wrongly state that it "has a smooth body." 



1 The British Woodlice, 1906, p. 34. 



66 s 



"* 



' 



UJ I 



