Ground Beetle

Demetrias imperialis


Over all length 4.5 to 5.8mm. There are three species found in Britain but all, fortunately, have distinctive patterns on the elytra. Demetrias imperialis has a black mark in the centre of the elytra with another black mark further back and towards the edges of the elytra. The head is black and larger than the brown pronotum.


Normally found amongst Reeds (Typha), Bulrushes (Typhus) and Sedges (Carex), or in the reed litter. The adults hunt small insects amongst the stems or in the litter.

Status and distribution

Mainly confined to the south and east of England, where it is local. Uncommon in Nottinghamshire and recorded once at Netherfield Lagoons.

Best time to see

March to June.