Stainforth: The Guests of Yorkshire Ants. 393 
common species not only in the south, but also in the northern- 
most counties of England. Evansia moerens Camb., another 
spider of this class, has been found in the Huddersfield district, 
Cleveland district, and at Redcar. It usually occurs with the 
host species, D. nigra and F. fusca. Tetrilus arietinus Thor. 
and Cryphoeca diversa Camb. are two myrmecophilous spiders 
which may possibly be found in Yorkshire. The former 
associates with F. rufa and D. fuliginosa, and has been cap- 
tured at Oxshott (Surrey), and in Wales. The type female 
of Cryphoeca diversa was taken at Carlisle, and the species 
has also occurred at Oxshott and in Berkshire. The host ant 
is Formica rufa. 
HostTiL—E PERsEcUTED LopGers.—The third class includes 
the unwelcome guests, the ‘ hostile persecuted lodgers.’ About 
two dozen British species live by their wits or by superior 
strength at the expense of ants, and eleven of these have up 
to the present been observed in Yorkshire. These are :— 
Altéochara ruficoynis Gr., Studley, Copgrove, Scarborough 
and Saltburn. 
Thiasophila angulata Er., Scarborough, York. 
Myrmedonia humeralis Gr., Scarborough. 
Drusilla canaliculata F., common generally. 
Notothecta flavipes Gr., Scarborough. 
N. anceps Er., Scarborough. 
Lamprinus saginatus Gr., Scarborough. 
Quedius brevis Er., Scarborough. 
Leptacinus formicetorum Mark., York, Scarborough, Don- 
caster. 
Othius myrmecophilus Kies., Filey, Scarborough, Hackness, 
Saltburn, Ingleton, Stanghow Moor, Hutton Moor, Lunedale 
and Edlington. 
Clythra quadripunctata L., Scarborough, Kirkstall Woods 
and Wentbridge. 
Drusilla canaliculata | have captured on many occasions 
during the year, invariably in the neighbourhood ot an ant 
colony, as at Hessle, Kelsey Hill, South Cave and North Cave. 
It appears to have a preference for species of Myrmica, but one 
example occurred near a nest of D. flava. Dr. W. J. Fordham 
informs me that F. rufa occurs at Wentbridge, whence he has 
a specimen of Clythra. 
Of the remaining thirteen beetles in this group, ten are 
rigidly southern species, and there is only likelihood of three 
being eventually discovered in Yorkshire. These are Myrme- 
dona collaris Pk., found witb ants of the genus Myrmica in the 
south and south-east, in Leicestershire and in the Tweed 
district ; Myrmedonia limbata Pk., found in the south, in 
Lincolnshire, and in the Northumberland district and Scot- 
land; and Xantholinus atratus.Heer., found chiefly in the 
1915 Dec. 1. 
