Notes: Rare immigrant from mainland Europe, appearing in southern England. First recorded in Britain by John Langmaid at Southsea, Hampshire, on 9 July 2001. In Hampshire and on the Isle of Wight there have been more than 30 records to date, mostly on the south coast. Wingspan 34-40 mm. Very similar to Lesser Broad-bordered Yellow Underwing N. janthe, from which separable in some cases only by dissection of genitalia. Set specimens of N. janthina sometimes separable by black outer border of hindwing, which on N. janthe either stops before the costa or extends diffusely along it, while on N. janthina, it is generally broader, and extends along costa without a gap, so the overall effect is of a black hindwing with a yellow spot. On underside of forewing of N. janthe, the distal edge of black area is usually distinctly toothed. Larva feeds on various herbaceous plants, no evidence of breeding in the UK.

Flightime guide
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