Grass Wave Geometridae

Perconia strigillaria (Hubner, 1787)

Description: Wingspan 36-41mm. Adults often vary in size, colour and in the number and width of the cross-lines on the wings. The typical form tends to be light whitish brown, with brown cross-lines. Darker heavily marked individuals are common in some populations.

Key Identification Features:

Sets:  male upperside

Flight Period: End of May to mid-July.

Status: Scarce and local. The majority of recent records are from Mullenakill NNR and Derryhubbert in Peatlands Park, and the Argory, Armagh. In Fermanagh there have been recent records from Braade and Correl Glen. It has previously been recorded from Mossvale in Antrim back in the early 1950s and Tempo, Fermanagh in the early part of the 20th century.

Ecology: A scarce bogland species, which has declined and been lost from some of its former haunts due to habitat destruction and changes in agriculture practice. Adults can be flushed from the vegetation during the day, but its normal flight period is from dusk onwards. The larvae can be found from August through to May of the following year on Heather Calluna vulgaris, Broom Cytisus scoparius and Gorse Ulex europaeus. It overwinters as a larva.

World Distribution: Europe including Scandinavia east to Asia Minor.

Bradley & Fletcher number: 1970 Agassiz number: 70.295

Additional information:

UK Moths account


 Thompson, R. S. & Nelson, B., 2003 (Oct 2). [In] The Butterflies and Moths of Northern Ireland