Common immigrant from mainland Europe, appearing throughout the British Isles, abundantly in some years, but most frequently and numerously in the south. In Hampshire and on the Isle of Wight a common immigrant, which is widely distributed throughout in some years. Wingspan 25-34 mm. Until recently, this was regarded as an absolutely unmistakable species, but it is now known to comprise a species complex of considerable size, one of which, N. nearctica
, has been recorded in Britain. Larva feeds on Leguminosae, over-wintering as a pupa.