Elateridae of the British Isles

Adrastus rachifer (Fourcroy, 1785)

Size – 3-4mm.

Description – A very small species. The elyra are predominantly dark brown with orange/yellow along the outer edges, darkening towards the posterior. The head and pronotum are dark brown, with oragne/yellow tips to the angles of the pronotum. There is a dense covering of hairs and obvious pits forming rows running down the elytra. The legs and antennae are yellow and the antennae are very long, extending a way beyond the posterior edge of the pronotum.

National Biodiversity Network map showing the distribution of Adrastus rachifer across Britain and Ireland.

British and Irish distribution of Adrastus rachifer (Fourcroy, 1785) based on records held by the National Biodiversity Network.

Distribution data supplied by:

  • Natural England

Distribution – Confined to the Kent coast.

Biology – Imago insects emerge in June and July and can be found by beating the foliage of a wide range of broadleaved tree species and resting on tree blossom and the flowers of low growing herbaceous plants including Umbellifers, Mullein (Verbascum thapsus) and Hop (Humulus lupulus), (du Buysson in Leseigneur, 1972).

Habitat – Fens, river banks, wet woodland.