100 Terrestrial Isopoda (Woodlice) of Yorkshire. 
Saltburn, August, 1908 ; Bridlington, August, 1908; Flam- 
borough, August, 1909; Scarborough, August, I913. 
Genus LicipIuM Brandt. 
Ligidiun: hypnorum Cuvier.—Up to the present, this 
species has not been found in the north of England. British 
records so far are from Essex, Surrey and Warwickshire, but 
seeing that it occurs in Sweden and Denmark, there is no 
reason why we should not find it in Yorkshire, especially seeing 
that we have many suitable places for it. Its habitat is wet 
moss, so I should like to ask our moss men to keep a sharp 
look-out for any Woodlice, when collecting on boggy moors or 
damp and wet woods. 
This species is distinguished from L. oceanica by its smaller 
size, and its abdomen being much narrower than the body. 
It most resembles Philoscia muscorum, both being about the 
same size, 9 mm., and both having the abdomen narrower than 
the body. There is, however, a marked difference in the tail 
appendages, in L. hypnorum both the tail appendages are alike 
in shape, while in the P. muscorum the outer divisions of the 
tail appendages are broader than the inner ones, and in the 
former species the flagellum of the antennz consists of about 
ten joints, whilst in the latter there are only three. 
FAMILY TRICHONISCIDA. 
Genus TRICHONISCUS Brandt. 
TRICHONISCUS ROSEUS Koch.—The colour of this species 
varies from, pale rose to deep coral red, with generally a yellow 
mark down the middle of the back. Specimens taken in the 
open are deeper in colour than those obtained from greenhouses. 
It is to be found in most gardens, especially on rockeries under 
creeping plants and loose stones, on hedge banks, under dead 
leaves and sticks, in old quarries, under stones, old wood, or 
rubbish. This is one of the species that seems to require a 
certain amount of moisture for its existence. It is not at all 
uncommon and is undoubtedly an endemic species.’ 
Dowley Gap, Bingley, October 1909; Lister Park, Brad- 
ford, November, 1908; Calverly, S. Margerison, April, 1908 ; 
Knaresborough, October, 1908 ; Gisburn, J. Beanland, Septem- 
ber, 1910 ; Harewood, Yorkshire Naturalists’ Union Meeting, 
May, 1911; Elks Wood, Ingleton, June, 1912; Canal Banks, 
Bradford, Bingley, Keighley, and Kildwick, May, 1913; 
Bolton Abbey, August, 1911; Bellbusk and Seattle, May, 
1914; Castle Hill, Scarborough, August, 1913; Collingham 
and Boston Spa, July, 1915; Aberford, September, 1915. 
TRICHONISCUS PUSILLUS Brandt.—This is one of the com- 
monest of our British Woodlice, and is to be found in many 
Naturalist 

