and Occurrence as British, of Lomechusa strumosa. 419 
“ Pseudogynes”” are produced fewer pupz are dug up, till 
at last the destruction of the colony is brought about. 
In North America a beetle, Xenodusa cava, closely 
related to ZLomechusa, occurs with Formica rubicunda, a 
race of Formica sanguinea. Father Wasmann stated that 
“ Pseudogynes” must occur in those nests; at first they 
could not be found, but after some time his correspondents 
succeeded in finding them in nests which contained the 
beetle, a veritable triumph for his theory. 
The distribution of Lomechusa strwmosa embraces the 
whole of Europe, North and Central Asia as far as Tibet. 
took is 
Ad ee Ol 
lo. 1. 
& go 3g 
pes 
Fic. 6. Formica sanguinea, 9. 
6 
mt G » Pseudogyne. 
” 
” ” . 
A. Pronotum. B. Mesonotum. co. Scutellum. 
D. Post-scutellum. £. Propodeum. 
The history of ZLomechusa asa British species is as 
follows :—In Stephens’ “ Illustrations, Mandibulata, Vol. iv, 
p. 108 (1832), we read: “ Very rare: I have hitherto seen 
two specimens (which are in the British Museum) only, 
one of which, I was informed by Dr. Leach, was taken by 
Sir H. Sloane, on Hampstead Heath in 1710; the other 
was captured by himself while travelling on the mail- 
coach between Cheltenham and Gloucester about twenty 
years since.” These two specimens are still in the 
Museum at South Kensington. It is given as British in 
G. R. Waterhouse’s catalogues of 1858 and 1861, and 
Rye’s of 1866. In Crotch’s catalogue of 1863 it is 
“reputed British,’ and in his second edition, 1866, as 
“doubtfully indigenous.” After this it is altogether 
