THE BRITISH WOODLICE. 



§3 



Genus -LIGIDIUM Brandt, 1833 (3), p. 173 

 Zia, Koch (34). 

 Abdomen narrow; habitat, wet moss. 

 In Ligidium there are numerous joints to the flagellum, lateral 

 lobes are absent from the head, and the tail appendages are com- 

 pletely to be seen. All the segments of the abdomen are 

 distinctly narrower than those of the thorax and in this it agrees 

 with Trichoniscus, Trichoniscoides, Philoscia, and Metoponorthus. 

 In these, however, the flagellum has never more than seven 

 joints, the tail appendages (as in all genera but Ligia and 

 Ligidium) are partially hidden by the last segment, and in all the 

 four but Philoscia there are lobes to the head. 



Ligidium hypnorum, Cuvier. Plaie II. 



1792 Oniscus hypnorum Cuvier (9), pi. XXVI., figs. 3—5. 



1793 Oniscus agilis Persoon, quoted by Koch in Panzer (51), part 5, pi. XXIV. 

 1830 Ligia hypnorum Bosc (2). p. 179. 



1833 Ligidium persoonii J. F. Brandt (3>, p. 174, pi. IV., figs. 6—7. 



1840 Zia agilis Koch (34). part 34, pis. XXII. and XXIII. 



1844 Ligidium personii Zaddach (77), p. 17. 



1853 Ligidium personii Lereboullet (39), p. 14, pi. I., fig. 1, pi. II., figs. 20—31. 



1857 Ligidium personii Kinahan (32), p. 275, pi. XXI., fig. 14, pi. XXII., fig. 9. 



1873 Zia saundersii Stebbing (70), p. 286. 



1873 Ligidium agile Norman (48), p. 419. 



Ligidium hypnorum Budde-Lund (8), p. 254. 



only British 



1885 



1898 Ligidium hypnorum G. O. Sars (59), p. 158 pi. LXXI 



This species, which like the last, is the 

 representative of its genus, was added to our 

 fauna in 1873 by the Rev. Thomas R. R. 

 Stebbing (70) who found specimens in the 

 neighbourhood of Copthorne Common, Surrey. 

 Up to the present time, when we are pleased 

 to announce that we discovered it in the 

 spring of 1902 at Warley in Essex, Ligidium 

 hypnorum has not been recorded from any other 

 place in the British Islands. 



As the name of the species implies, it lives 

 in wet situations and in its turn connects Ligia 

 with the forms which inhabit drier places. 

 Ligidium hypnorum might be mistaken for 

 Philoscia muscorum, but as already pointed out in 

 the generic description, the latter has but a few 

 (three) joints to the flagellum, instead of from joint of the antenna 



x \ a ° t of Ligidium hypnorum 



ten to thirteen. From Ligia, the species under 



consideration is distinguished by its small size, narrow abdomen, 



and habitat. 



FIG. 36.— FLAGELLUM 

 AND LAST PEDUNCULAR 



