This species lives chiefly at the roots of grass and under the stones or sticks that lie among it. _Philoscia muscorum_ has a very smooth and shining body, and its long legs enable it to move very rapidly. The ground colour of its dorsal surface varies from light yellow to deep brown. There are characteristic dark markings down the middle of the thorax and on the sides, between which are lighter patches. In dark coloured specimens the markings are by no means so evident. [Illustration: FIG. 44.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Philoscia muscorum_.] _BRITISH LOCALITIES:--_ _England_: High Beach, Epping; Warley; (W.M.W.): Maldon; (W.M.W. from R.M.): Kew; Langley; Hanwell, yellow variation; Bluebell Hill, Maidstone; (W.M.W.): Liphook; (C.S.): Pamber Forest; Kingston-on-Soar; (W.M.W.) _Scotland_: (Scott, 68). _Ireland_: Almost throughout; (Scharff, 63). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Spain; (12): Sicily; (19): Hertsogovinia; (22): Sweden; (21): Norway; Denmark; Prussia; Germany; Holland; Poland; Austria; Italy; (59): Sardinia; (21). _Africa_: Algeria; Tunis; (24). =Philoscia couchii= Kinahan. PLATE XI. 1858 _Philoscia couchii_ Kinahan (33), p. 195, pl. XXIII., fig. 4. 1868 _Philoscia couchii_ Bate and Westwood (1), p. 1885 _Ligidium couchii_ Budde-Lund (8), p. 257. 1885 _Philoscia longicornis_ Budde-Lund (8), p. 221. 1897 _Philoscia couchii_ Dollfus (21), p. 72, pl. I., fig. 1. _Philoscia couchii_ is an inhabitant of the sea-side; it is smaller than the last species, its colour to the naked eye is a uniform lead-grey, and its antennæ are very large (compared with its size) and hairy. This species was discovered by Professor Kinahan when in the company of Messrs. Bate and Westwood near Polperro in Cornwall in the year 1858, and dried specimens presented by him are in the British Museum (Natural History). _BRITISH LOCALITIES:--_ _England_: Talland Cove; Polperro; (Bate and Westwood, 1): Salcombe, Devon; (Norman, 49): Meadefoot, Torquay; (Stebbing in 49). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Spain; (12): Sicily; (19): Sebastopol; (Norman, 49). _Africa_: Azores; Canaries; Morocco; Algiers; Tunis: Egypt Senegal; (24). _Atlantic Isles_: Canaries; Azores; (21). _Asia_: Syracuse; Bazone (18). [Illustration: FIG. 45.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Philoscia couchii_.] _Genus_--=PLATYARTHRUS= Brandt, 1833 (3), p. 174. [_Typhloniscus_ Schöbl (66), p. 279.] _Flagellum with one joint; eyes wanting; abdomen broad; habitat, ants' nests._ The broad body, which is much flattened, and the very thick antennæ distinguish _Platyarthrus_ from the other small woodlice (Trichoniscidæ). =Platyarthrus hoffmannseggii= Brandt. PLATE XII.