Elateridae of the British Isles

Calambus bipustulatus (Linnaeus, 1767)

Size – 6.5-9mm.

Description – A more rounded and quite variable species. Common colour combi9nations are chestnut brown pronotum and elytra, chestnut brown elytra with a darker brown pronotum and a dark brown pronotum and elytra with chestnut/red ’shoulder’ patches at the anterior of the elytra. Often appearing quite metallic with strong ridges down the length of the elytra and a concave area in the centre of the pronotum towards the rear. Legs are uniformly brown, with antennae around the length of the head and pronotum.

National Biodiversity Network map showing the distribution of Calambus bipustulatus across Britain and Ireland.

British and Irish distribution of Calambus bipustulatus (Linnaeus, 1767) based on records held by the National Biodiversity Network.

Distribution data supplied by:

  • Countryside Council for Wales
  • Natural England
  • Leicestershire Environmental Resources Centre
  • Wiltshire and Swindon Biological Records Centre

Distribution – A scattered distribution in southern England up to Leicestershire and Wales.

Biology – The larvae are predatory and occupy soft rotten stumps and trunks of predominanatly Oak (Quercus rober) and other broadleaved tree species. The larvae pupate at the end of the summer season and ecloses before the winter, the imago insect spending the winter inside the pupa. On emergence, imagos are known to feed on Blackthorn (Prunus spinosa) and Hogweeds (Heracleum) during the day.