422 Mr. H. St. J. Donisthorpe on the Colonisation of 



Wasmann once found it in some numbers moving with 

 Lasius fuliginosus to a new nest at Exaeten. 



Species of the genus Myrmedonia belong to the hostile 

 persecuted lodgers and prey on ants. I have shown that 

 this and other species protect themselves if attacked when 

 introduced into new nests, and to strange ants, by the 

 secretion which they give ofif. 



Myrmedonia humeralis, Gr. 



Primary host. — Lasius fuliginosus, Ltr. 



Secondary hosts. — Formica rufa, L., Q.^^iwatensis, De G. 



Scott took it in moss at Renfrev/. (" Zool. 1852," p. 

 3462.) 



Linnell records one example at Redstone in 1855, which 

 had probably strayed from a nest of i^. rufa, of which there 

 were several at that time in Redstone Wood ("Reigate 

 List, 1898," p. 12.) 



A specimen was taken by Blatch under a stone in a dry 

 ditch at Hunstanton. (E. M. M., 1882, XIX, p. 139.) 



Walker records it in faggots in the Blean Woods. 

 (E. M. M., 1898, p. 208.) 



Wasmann mentions it running on roads. 



The pairing which I have recorded is like that of 

 Lomechusa. (■'' Ent., Rec, 1908," p. 283.) 



I have taken the larvae in company with the beetle and 

 F. rufa near Knowle. 



Myrmedonia cognata, Mark. 



Normal host. — Lasius fuliginosis, Ltr. 



A single specimen was taken by O. E. Janson on the 

 stump of a felled tree at Hampstead on June 3rd, 1855. 

 ("Ent. Ann., 1857," p. 72.) 



One example was taken by 'Wasmann with Lasius niger 

 in May in Dutch Limburg. He found several specimens 

 with Lasius hrunneus in a tree in company with other 

 guests of L. fuliginosus. 



On March 25th, 1886, he found specimens moving with 

 L. fuliginosus at Exaeten from an old nest to a new one. 



I have bred this species in my L. fuliginosus observation 

 nest, 



Myrmedonia lugens, Gr, 



Normal host. — Lasiits fuliginosus, Ltr. 



A single specimen was taken in July with L. hrunneus 



