Mr 
ANNALES, XLII (1908). 127 
ON THE OCCURRENCE IN BELGIUM OF A RECENTLY 
_ DESCRIBED TERRESTRIAL ISOPOD, TRICHONISCUS STEB- 
BINGI PATIENCE 
By Ricxarp $. BAGNALL, F. E.S. 

Although I have on two occasions had further opportunities of 
. carrying out investigations with regard to the fauna of the Brussels 
Botanical Gardens, [ have only been able to find one woodlouse that 
. was not recorded in my last note (Ann. Soc. ZooL. Becc., XIII [1907/, 
pp. 263 to 266). As, however, this single addition is a species which 
. has only been recently described by my friend Mr. PATIENCE a few 
words with reference to it will not be out of place. 
TRICHONISCIDÆ. 
Genus TRICHONISCUS Branpr, 1833. 
Trichoniscus Stebhbingi PATIENCE. 
Trichoniscus Stebbingi PATIENCE, JOURNAL LiNNEAN Socigry (Zoology, XXX, 
No. 195, pp. 42-44, pl. 7, 1907. 
This species is about 3.5 millimetres in length, oblong-ovate, and 
has the dorsal surface very strongly tuberculate, the tubercles being 
_arranged transversely in rows across the segments. It looks very 
distinct in the field owing to the antennæ, legs and uropoda being 
quite devoid of pigment, the general color of the body being dark 
reddish-brown marbled with white. Ihave, however, taken at the 
roots of various plants many examples which are almost white, and 
some which are of a beautiful pink color. 
When PATIENCE described the species he pointed out that it was 
. easily distinguished from all other British species of Trichoniseus by 
the form of the last segment of the metasome which is broadly and 
evenly rounded at the tip, instead of being truncate, Two other 
