THE BRITISH WOODLICE. 23 
Professor Sars in his Crustacea of Norway (p. 162) describes from Christiania, 
under the name of Zrichoniscus pygmeus, a still smaller species. As this may 
possibly be discovered n this country a brief comparison between it and 
Lrichoniscus pusillus may be of value. The former reaches 
alength of but two millimetres ; itis ‘* whitish, semi-pellucid 
with a few light brown pigmentary ramifications 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 Tvichoniscus pusillus is smooth 
and polished. It has four joints to the flagellum 
—Dr. Scharff (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; ric. 37.-rracettum 
Bluebell Hill, Maidstone ; (W.M.\W.): Chisle- jonror tie anteNna 
hurst ; Plymouth; Polperro; Looe; (Bate and Bi Tae 
Westwood, 1): Hertfordshire ; Northumber- 
and; Durham; (Norman, 49): Exeter; (Parfitt, 53). 
Scotland : Edinburgh ; (Scott, 68): Cumbrae; (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. Prate IV. (from a spirit 
specimen), 
1840 Itea vivida Koch (34), part 34, pl. IV. 
1858 Philougria vivida Kinahan (33), pp. 197 and 198, pl. XXIILI., fig. 2. 
1868 Philougria vivida Bate and Westwood (1), Vol. II., pp. 458 and 459, figs. 
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 Tvichoniscus 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 Tyvichoniscus vividus while in the other, as already pointed 
