Description: Wingspan 38-44mm. From late September to the end of November.

World Distribution: Throughout Europe including Scandinavia.

Irish Distribution: The most common species of this genus. Reliably recorded from many localities in southern counties but more localised further north. More frequently encountered that the Pale November Moth E. christyi.

Ecology: An autumn-flying species found in a variety of upland and lowland habitats such as, woodlands, fens, heaths and bogs. Adults rest among the foliage, on the trunks of trees and occasionally fence posts. They are attracted to light in moderate numbers. The larvae can be found from April to June on a variety of trees including oak Quercus spp., birch Betula spp., Blackthorn Prunus spinosa, Hawthorn Crataegus monogyna, and apple Malus spp. It overwinters as an egg.

Key Identification Features:

• Difficult to identify with certainty; requires genital examination

Distribution Map from NBN: Epirrita dilutata at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Epirrita dilutata at iNaturalist World Species Observations database.