TERRESTRIAL ISOPODS FROM NORTH DEVON. 467 



and the North Devon coast. At Plymouth Mr. Hewitt found 

 them most numerous, and of maximum size on Drake's Island. 

 At Santon the smaller specimens, which are mottled with light 

 patches (though these patches are faintly visible even in adults), 

 I found most frequently near the water's edge, and the large 

 ones for the most part always a considerable way above high- 

 water mark. On St. Kilda Mr. Hewitt has found these seashore 

 feeders on a hill no less than 450 ft. above the level of the sea. 

 They have very strong claws on the feet, a necessary equipment 

 to allow them to run about under moving water. 



Trichoniscus pusillus, Brandt. — Common everywhere in grassy 

 damp places. They are very delicate creatures. 



T. roseus, Koch. — On March 10th this year, underneath flat 

 stones near a pool at Venn, Barnstaple, I noticed several of this 

 handsome species. Three were white in colour instead of pink, 

 but the yellow dorsal line was present in all. Since that time I 

 have found them common at Venn within restricted limits. 

 Occasionally they were consorting with ants and with impunity. 

 As a rule, Woodlice keep clear of ants' nests. 



Trichoniscoides albidus, Budde-Lund. — I base my record of this 

 species on a headless specimen taken from the grass with which a 

 Common Shrew {Sorex vulgaris) had built her nest in a field near 

 Barnstaple. It was pure white, with large round tubercles on the 

 dorsal surface (which Haplothalmus danicus, Budde-Lund, also 

 has), the posterior angles of each thoracic segment were prolonged 

 and protruded considerably, and the upper surface generally was 

 flat. The lateral edges of each segment were serrated, there being 

 about, on an average, five teeth to either side of each segment. 

 [The figure of this species in ' British Woodlice ' shows eight or 

 nine. J The species has been taken, as far as I am aware, only at 

 Eton and in Sunderland, in Great Britain (W. M. Webb). Before 

 feeling satisfied as to the correctness of my identification, I 

 should like to take other specimens from the same neighbour- 

 hood. If my fragment does not belong to this species, as far as 

 I can see it can belong to no other species at present on the 

 British list. 



Oniscus asellus, Linn. — Common. 



Philoscia muscorum, Scop. — Common everywhere in grass- 

 tufts and under stones. The hind legs are very long, and it runs 



