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NOTE ON THE OCCURRENCE IN YORKSHIRE OF 
TRICHONISCOIDES SARSI, Patience: A WOOD- 
LOUSE NEW TO THE BRITISH FAUNA. 
By Ricwarp §. Baanau, F.L.S. 
In his great work on ‘ The Crustacea of Norway,’ Prof. G. O. 
Sars carefully described and figured a golden-yellow T'rich- 
oniscoides, which he referred to the 7. albidus of Budde-Lund, 
but which Mr. Patience has recently shown to be quite distinct 
from the true albidus, the two most easily determined characters 
lying in the flagellum of the antenna, which, in Sars’ species, 
possesses four instead of three joints, and in the form of the 
meral joint of the seventh pereopod in the male. Patience has 
shown that these characters are amplified by very distinct 
structural differences in the pleopoda of the males. 
I have taken TJ. albidus, B.-L., in several localities, often 
in some numbers, and the impression it gives me in the field 
is that of a sluggish Trichoniscus pusillus, having its dorsal 
surface of a similar claret or reddish-brown colour, but dull 
instead of glossy, and the underside noticeably whitish. But 
Sars distinctly says that his species is of a golden-yellow colour, 
and linear in form. 
Recently I had the opportunity of collecting for nearly an 
hour on the cliffs near Whitby, which I devoted chiefly to the 
Pauropoda and Symphyla, but met with several woodlice, viz. 
Trichoniscus pusillus, Brandt, T. pygmeus, G. O. Sars, Trich- 
oniscoides albidus, B.-L., several Haplophthalmus mengu, Zadd., 
Oniscus asellus, L., Philoscia muscorum, Scopoli, Porcellio 
scaber, Latr., and a linear, golden-yellow Trichoniscid, quite 
distinct from T’. albidus, B.-L., on the field, and agreeing well 
with the albidus of Sars, for which Patience has proposed 
the name— 
Zool, 4th ser. vol. XVI., May, 1912. Q 
