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Broad-bordered Yellow Underwing Moth

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description Broad-bordered Yellow Underwing Moth Overview

Noctua fimbriata, the Broad-bordered Yellow Underwing, is a moth of the family Noctuidae found across Europe and parts of Asia. It has a wingspan of about 45 to 55 millimetres, shows sexual differences in coloration, and has orange hindwings with a broad dark marginal band. The species occurs in varied habitats but commonly uses woodland, and adults are generally on the wing from July to September.

help Broad-bordered Yellow Underwing Moth FAQ

What does Noctua fimbriata look like when it opens its wings?

Its hindwings are orange with a very broad black marginal band, while the forewings can be brown, rufous, or olive-green. Its wingspan is about 45 to 55 millimetres. ([UKmoths](https://ukmoths.org.uk/species/noctua-fimbriata/))

Where is the Broad-bordered Yellow Underwing found, and when does it fly?

It occurs across Europe, including Britain, and extends into parts of Asia. In Britain, adults usually fly in one generation from July to September. ([UKmoths](https://ukmoths.org.uk/species/noctua-fimbriata/))

How can I tell Noctua fimbriata from the Large Yellow Underwing?

The Broad-bordered Yellow Underwing usually has a much broader black band on the orange hindwing, while the Large Yellow Underwing has a narrower band and a forewing discal spot. Both are similarly sized Noctua moths, so the wing markings are the useful clue. ([Butterflies and Moths of Northern Ireland](https://www.habitas.org.uk/moths/species.asp?item=6196))

Are male and female Broad-bordered Yellow Underwings different colours?

Yes, this species shows marked sexual dimorphism. Males are generally darker brown, while females are more often orangey-buff. ([UKmoths](https://ukmoths.org.uk/species/noctua-fimbriata/))

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