Common Swift Korscheltellus lupulina
(Linnaeus, 1758)[Synonyms: Hepialus lupulinus]
Wingspan 25-40 mm.
The commonest of the Swift moths, distributed widely and sometimes abundantly throughout much of Britain, though rather more local in Scotland. It occurs in almost any grassy habitat.
The adults fly in May and June. Feeding on the roots of grasses and small plants, the larvae live underground.