The Dark Crimson Underwing (Catocala sponsa) is a moth in the Noctuid family. This species is a Red Data Book species in the South of Britain.

The wingspan is 60–70 millimetres (2.4–2.8 in). The moth flie
Dark Crimson Underwing TL

When the Dark Crimson Underwing is active

s from July to September depending on the location. The larvae feed on oak.
Red Status

The Dark Crimson Underwing is in the Red Data Book

This species is very similar to the Light Crimson Underwing, but the hindwing on the central cross-band is consorted into a w shape. Also this species tends to be larger, with a length of 29-34mm, and the moth is also darker, with less variation of the pattern.

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