Elateridae of the British Isles

Cidnopus aeruginosus (Olivier, 1790)

Size – 9-12mm.

Description – A rather elongated species, dark brown to black in colour with a dense, very obvious covering of lighter brown hairs. The legs are brown. In males the antennae are long and extend beyond the posterior edge of the pronotum, in females they are somewhat shorter, being only the length of the head and pronotum.

National Biodiversity Network map showing the distribution of Cidnopus aeruginosus across Britain and Ireland.

British and Irish distribution of Cidnopus aeruginosus (Olivier, 1790) based on records held by the National Biodiversity Network.

Distribution data supplied by:

  • Royal Horticultural Society
  • Countryside Council for Wales
  • Natural England
  • Highland Biological Recording Group

Distribution – Scattered records throughout England and Wales, with a handful in north-east Scotland. The species appears to be most numerous in south Wales and North and East Yorkshire.

Biology РLarvae develop underground and feed on the roots of various grass species. Imago insects emerge from late April and are active until June. They fly at night, but during the day can be found resting on grasses and the blossom of various tree species including Hawthorn (Crataegus monogyna), Oak (Quercus spp.), Willow (Salix spp.), Birch (Betula spp.) and Poplar (Populus spp.).

Habitat – Coastal grasslands, marshes, scrub and other areas with sandy soils.

Photo by D. Telnov courtesy of www.zin.ru/Animalia/Coleoptera