88 THE BRITISH WOODLICE.
consideration. Platyarthrus hoffmannseggii is small and white and
the edges of its side plates are toothed, but it is oval in shape,
possesses no eyes, and its stout antennae have but a single joint
to the flagellum instead of four. On the Continent this species
has been found in rich soil.
BRITISH LOCALITIES :—
England: Eton ; (Stebbing, 71a, p. 113).
FOREIGN DISTRIBUTION :—
Europe: France ; Wimereux and Lyons, Foret (25) : Norway ; Denmark ; (59)
Genus—HAPLOPHTHALMUS Schobl, 1850 (66), p. 449 .
Abdomen broad (comparatively) ; eyes simple ; flagellum with three
joints ; back tenth longitudinal ridges.
The body of Haplophthalmus is long in proportion to its width,
but there is no abrupt decrease in the breadth of the abdomen as
seen in Trichoniscus and Trichoniscoides. The eyes are simple as
in the latter genus and the lateral lobes of the head are rather
large, while the side plates of the body are well separated.
Haplophthalmus mengii Zaddach. Plate VII.
1844 Itea mengii Zaddach (77), p. 16.
1860 Haplophthalmus elegans Schobl (66), p. 440.
1885 Haplophthalmus mengii Budde-Lund (8), p. 250
1898 Haplophthalmus mengii Sars (59), p. 167, pl. LXXIV., fig. 1.
The Rev. Canon Norman discovered two specimens of this
species in Ireland in June, 1899 (50) ; in the
previous year one of us (Mr. Webb) found a
single example at Eton Wick.
The main differences between the members
of this genus and their allies are set forth in the
generic description and incidentally elsewhere,
so we shall content ourselves with giving the
distinctive points of the two British species.
Haplophthalmus mengii has a number of raised
longitudinal ribs on each segment of the thorax,
the outer ridges being somewhat broken. There
are also two prominent ribs upon the third
segment of the abdomen.
BRITISH LOCALITIES:—
England: Eton; (Stebbing, 71a, p. 114).
Ireland : Corcumroe Abbey ; Co. Clare
(Norman, 50).
FOREIGN DISTRIBUTION:—
Europe: France; (25): Norway; Prussia; Germany; Bohemia; (59).