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). 



FOREIGX DISTRIBUTION :— 

 Europe : France ; Wimereux and Lyons, Foret (2$) : Norway ; Denmark ; (59) 



G^fs-HAPLOPHTHALMUS School, 1850 (66), p. 449 . 



Abdomen broad (comparatively) ; eyes simple ; flagellum with three 



joints ; back with 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 Ilea mengii Zaddach (77), p. 16. 



i860 Haplophthalmus elegans Schobl (66), p. 449. 



1885 Haplophthalmus mengii Budde-Lund (8), p. 250 



1898 Haplophthalmus mengii Sars (59), p. 167, pi. LXXIV., fig. 1. 



The Rev. Canon Norman discovered two specimens of this 

 species in Ireland in June, 1899 (5°) 5 m the 

 previous year one of us (Air. 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. 



FIG. 41. — FLAGELLUM 

 AND LAST PEDUNCULAR 

 JOINT OF THE ANTENNA 



OF Haplophthalmus 

 mengii. 



Europe 



BRITISH LOCALITIES:— 



England: Eton; (Stebbing, 71a, p. 114). 

 Ireland : Corcumroe Abbey ; Co. Clare 

 (Norman, 50). 



FOREIGN DISTRIBUTION:— 

 France ; (25): Norway ; Prussia ; Germany ; Bohemia; (59). 



