Portland Ribbon Wave Idaea degeneraria: Distribution map

Please note that the NBN Gateway map service has been terminated as of 1 April 2017.

As soon as a replacement map service is available, distribution maps will hopefully appear here again.

In the meantime, you can get some idea of distribution from the NBN Atlas website.

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70.017 BF1714
Portland Ribbon Wave Idaea degeneraria

(Hübner, [1799])


Wingspan 26-31 mm.

The stronghold of this moth in Britain is an area in Dorset, on the Isle of Portland. It also occurs occasionally as a migrant along the south coast.

Flying in June and July, sometimes later on the continent, the species is attracted to light.

Little is known of the foodplant in the wild in Britain, but in captivity the larvae will feed on dandelion (Taraxacum) and knotgrass (Polygonum).
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