Entoma
Riband wave, Idaea aversata, plate

Geometer moths

Idaea aversata

Riband wave

The riband wave flies in two distinct forms, one with a bold dark central band and one almost plain, occurring in roughly equal numbers.

WhereGardens, hedgerows, grassland
Size23 to 35 mm wingspan
WhenJune to October

It is a small pale moth with a slender body and three fine cross-lines on the forewing; a darker band between two of these lines is strong in one form and nearly absent in the other.

Its caterpillars feed on low-growing plants such as dock and dandelion, and a second generation often appears in warmer regions during autumn.

Traits

Habitat

Grassland

Colour

Yellow, Brown

Active

Night

To people

Harmless.

Activity through the year

Often confused with

Small fan-footed waveOpen entry ›
Idaea biselata

Small fan-footed wave is smaller and more uniformly pale, lacking the riband wave's broad central dark band in its typical form.

Questions

Is the Riband wave dangerous to people?

The Riband wave is harmless to people.

When can you see the Riband wave?

The Riband wave can be seen from June to October, at night.

Plate retouched from a photo by gailhampshire from Cradley, Malvern, U.K, CC BY 2.0, Wikimedia Commons Licence

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Butterflies and moths›Geometer moths›Idaea

Last updated 2026-09-26. Every entry is checked against published sources.