22 THE BRITISH WOODLICE, 
BRITISH LOCALITIES:— 
England: Warley, Essex; (W.M.W.): Copthorne Common, 
Surrey ; (Stebbing, 70). 
FOREIGN DISTRIBUTION:— 
Europe: France; (25): Sweden, Denmark, Germany; ($9): Turkey; (8). 
Family—TRICHONISCIDE. 
Flagellum with less than ten joints; head with lateral 
lobes; tail appendages partly hidden. 
Genus—TRICHONISCUS Brandt, 1833 (3), p. 174. 
Abdomen narrow ; eyes compound ; flagellum, usually with more than 
three joints 
In Trichoniscus the flagellum may have from seven to four 
(rarely three) joints. As in Trichoniscoides and Haplophthalmus 
there are lateral lobes to the head, though these are not very 
pronounced ; the body is also of small size, the abdomen narrow 
with both divisions of the tail appendages equally so, and almost 
of the same length though slightly covered by the last segment. 
The compound eyes distinguish Tvichoniscus from the two genera 
named, and from Platyarthrus, while its small size and the 
character of its tail-parts mark it out from all others. 
Trichoniscus pusillus Brandt. Prater III. 
1833 Trichoniscus pusillus Brandt (3), p. 174, pl. IV., fig. 9. 
1838 Itea riparia Koch (34), part 2 a pl. XVII. 
1844 Itea levis Zaddach (77), p 
1857 Philougria celer Ringer Gate 281, pl. XXII., figs. 1-4 
1858 Philougria viparta Kinahan a5. pp. 191 and 198, ph XXIil., fig. 1. 
1868 Philougvia riparia Bate and Westwood (1), p. 4 
1898 Trichoniscus pusillus Sars (59), p. 161, pl. LXXUL, ‘fig. 1 
This tiny species is found commonly amongst the roots of 
the herbage in very moist places. It presents a horny translucent 
appearance and is of a reddish brown colour. It runs with 
considerable speed, and when it is moving, the white irregular 
lines with which it is beset are not evident. Tvichoniscus pusillus 
is very much like Tvichoniscus vividus in colour but the latter 
species is nearly twice as big and has from five to seven joints 
to the flagellum, while the former has never more than four. 
Trichoniscus voseus is also much larger and its bright red colour 
(which it loses, however, when preserved in alcohol) is 
another means of distinguishing it from the species under 
consideration. 
