Description: Wingspan 28-33mm. From the beginning of July to mid-August.

Irish Distribution: Described by Baynes as being local and rare. Recent records indicate that it may be more widespread than initially thought, especially in southern counties where fieldwork has been more intensive. Recorded frequently from the Peatlands Park and Argory, Armagh, Lackan Bog, Down and Correl Glen NNR, Fermanagh.

Ecology: A species associated with a wide variety of habitats especially woodland, heathland and many of the bogs around southern shores of the Lough Neagh basin. The larvae have been reared in captivity on Dandelion Taraxacum officinale and Knotgrass Polygonum aviculare. It overwinters as a larva.

Key Identification Features:

• Sub-terminal line curved towards the costa
• No indent as in the Riband Wave

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

iNaturalist: Idaea straminata at iNaturalist World Species Observations database.