Wingspan 24 to 28 mm. An unmistakable species, the females are generally slightly larger and paler than males.

Good photographs and/or the specimen required.

It inhabits mature woodland.

The flight period of the adults is during June and July. Although sometimes flying in sunshine, it is normally encountered after dark at light.

The small, grub-like caterpillar is green, and feeds on Oak (Quercus) and Beech (Fagus).

This scarce species is mainly recorded from southern counties of England and East Anglia. In a recent survey to determine the status of all macro moths in Britain this species was classified as Nationally Scarce B

Generally rare or in rapid decline in VC55.