388 Stainforth: The Guests of Yorkshire Ants. 
recorded for the county. In this division are included beetles, 
etc., more or less immune from harm owing either to their 
activity, small size, hard integument, or some other property, 
which causes ants to look upon them with indifference. : 
One of the commonest examples of these, at any rate in 
East Yorkshire, is the small white woodlouse (Isopod) bearing 
the name of Platyarthrus hoffmannseggii Brandt. I have 
found this animal during the past year occurring abundantly 
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The ascertained distribution of Platyarthrus in Yorkshire 
and bordering areas. 
in the nests of various ant species in many parts of the East 
Riding, as at Weedley, near South Cave, in the nests of Formica 
fusca, Donisthorpea flava, species of Myrmica and D. nigra ; 
near Hull and at Kelsey Hill in Holderness with D. flava and 
Myrmica; Hessle Chalk Quarries in nests of Myrmica; in 
the Lias. pits at North Cave with F. fusca, D. flava, and D. 
nigra ; and at Holme-on-Spalding-Moor with JZyrmica laevin- 
odis and D. flava. It is also recorded* for Spurn, Scarborough, 
Barnscliffe, Monk Friston, and Adel Moor (near Leeds). Stan- 
* The Naturalist, 1910, pp. 176, 203, 370. 
Naturalist, 
