Description: Wingspan 22-24mm. From late May to the end of August.

Irish Distribution: Common and widespread in eastern counties with scattered records from the north (including Rathlin Island) and a few localities in the west namely Crom Estate, Garvary and Tullyreagh Bridge, Fermanagh. Recorded frequently in north Armagh at Peatlands Park and the Argory; also Lackan Bog and Belvoir Park Forest, Down. More commonly encountered than the Rivulet P. affinitata.

Ecology: A species normally associated with woodlands, bogs, and marshy areas. Adults come frequently to light in small numbers. The larvae can be found in August and September on hemp nettles Galeopsis. It overwinters as a pupa.

Key Identification Features:

• Size
• Double indention in the inner margin of the band on forewings
• Pale whitish coloured hindwings

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

iNaturalist: Perizoma alchemillata at iNaturalist World Species Observations database.