THE BRITISH WOODLICE. 



85 



Professor Sars in his Crustacea of Norway (p. 162) describes from Christiania, 

 under the name of J'richoniscus pygmceus, a still smaller species. As this may 

 possibly be discovered in this country a brief comparison between it and 

 Trichoniscus pusillus may be of value. The former reaches 

 a length of but two millimetres; it is " whitish, semi-pellucid 

 with a few light brown pigmentary ramications across the 

 segments and a double row of irregular opaque patches along 

 the middle of its back " (p. 163). Its body is covered with 

 minute tubercles and there are only three joints to the 

 flagellum ; its movements are by no means rapid. 



The body of Trichoniscus pusillus is smooth 

 and polished. It has four joints to the flagellum 

 — Dr. ScharfT (63) says three or four — and it 

 moves quickly. 



BRITISH LOCALITIES:— 



England : Brightlingsea ; Warley ; (W.M.W.) : 

 Epping Forest ; (Bate and Westwood, 1) ; 

 Hanwell ; Southall ; Kew Gardens; Langley ; 

 Burnham Beeches ; Dropmore ; Skirmett ; 

 Bluebell Hill, Maidstone ; (W.M.W.) : Chisle- 

 hurst ; Plymouth ; Polperro ; Looe ; (Bate and 

 Westwood, 1) : Hertfordshire ; Northumber- 

 land ; Durham; (Norman, 49) : Exeter; (Parfitt, 53). 



Scotland : Edinburgh ; (Scott, 68) : Cumbrae ; (D. Robertson, 



57). 



Ireland : Connemara ; (Norman, 49) : Dublin ; Wexford ; Cork 



and Kerry ; (Percival Wright teste Bate and Westwood, 1) : 



Tyrone ;Waterford ; Portlaw ; Kilkenny ;Wicklow ; (Kinahan 33). 



FOREIGN DISTRIBUTION:— 

 Europe-. France; (25): Spain; (15): Italy; (19): Norway ; Sweden ; 

 Denmark ; Germany; (59). 



Africa : Algeria ; Tunis ; Azores ; (24). 

 America : Niagara ; North America ; (59). 



Trichoniscus vividus, Koch. Plate IV. (from a spirit 

 specimen). 



1840 Itea vivida Koch (34), part 34, pi. IV. 



fig. 37. 



FLAGELLUM 

 ND LAST PEDUNCULAR 

 JOINT OF THE ANTENNA 



of Trichoniscus 

 pusillus. 



1858 Philouzna vivida Kinahan (33), pp. 197 and 19! 

 1868 Philougiia vivida Bate and Westwood (1), Vol 



, pi. XXIII., fig. 2. 

 II., pp. 458 and 459, fi£ 



This species is claret-brown in colour and under a lens it is 

 seen to be marbled with white, indeed in appearance it is much 

 like Tfichoniscus pusillus though twice the size. There are 

 important differences between the two species as regards the 

 number of joints to the flagellum. These vary from five to seven 

 in Trichoniscus vividus while in the other, as already pointed 



