Hepialidae (Swift moths)

The Hepiadlidae are primitive moths, with five of the 500 or so species occurring in the British Isles. All five have elongated wings which are held almost vertically against the body when at rest.  The main flight is from early dusk until full darkness. They come to light-traps, sometimes laying large members of eggs which collect in the base. Adults have no functional proboscis, so are incapable of feeding, and have very short antennae. The eggs are normally laid in a low flight over the foodplant. The larvae live underground, feeding internally or externally on plant roots, among which they pupate. The life cycle commonly takes two years to complete, with the larvae overwintering twice. (Taken from Waring and Townsend’s Field Guide to the Moths of Great Britain and Ireland)