The third British species of _Trichoniscus_ is of a deep pink colour and has a light yellow stripe down the back (in some habitats the animals are said to be quite white). Arranged in transverse rows upon the body are large tubercles, each of which under strong magnification will be found to end in a tiny hair. It is distinguished from _Trichoniscus pusillus_ by the larger size of its body, which is also comparatively broader, and from _Trichoniscus vividus_ by the four joints of the flagellum of its antennæ which latter have strong bristles upon them. In the former species there are five or more joints to the flagellum and the antennæ, though hairy, lack the bristles. _Trichoniscus roseus_ is to be looked for in old gardens. [Illustration: FIG. 39.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Trichoniscus roseus_.] _BRITISH LOCALITIES:--_ _England_: Warley; (W.M.W.): Maldon; (W.M.W. from R.M.): Stanmore; Hanwell; Ealing; Wimbledon; (W.M.W.): Berkhamsted; Torquay; (Norman, 49): Plymouth; (Bate and Westwood, 1 and B.M.,): Grassendale, near Liverpool; (R.W.): Newtownards; (R.W., Irish Nat, 1904, p. 260.) _Scotland_: Tarbert; (Scot, 68). _Ireland_: Dublin; Ballyfinder, Co. Down; (Scharff, 63): Templeogue; Dundrum; Blackrock; Rathgar, Co. Dublin; Bray, Co. Wicklow; (R.F.S.): Oakleigh; Kerry; (R.W.): Belfast; (Welch, Irish Nat., 1896, p. 213.): At the grave of Josiah Welch (grandson of John Knox), Castle Upton; Richhill, Co. Armagh; Castleconnell Ferry; (R.W.): Glenade House, Co. Antrim; (R.W. from R. Ll. Praeger). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Spain; (12): Italy; (59): Denmark; Germany; Holland; (39): Dalmatia; (18). _Africa_: Algeria; Tunis; (24). _Genus_--=TRICHONISCOIDES=, Sars, 1898 (59), p. 164. _Abdomen narrow; eyes simple; (or wanting); flagellum, with four joints._ The members of this genus are very much like those of _Trichoniscus_. In the latter, however, the hinder legs are longer in proportion and the eyes are compound. =Trichoniscoides albidus= Budde-Lund. PLATE VI. 1879 _Trichoniscus albidus_ Budde-Lund (7) p. 9. 1898 _Trichoniscoides albidus_ Sars (59), p. 165, pl. LXXIII., fig. 2. [Illustration: FIG. 40.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Trichoniscoides albidus_.]