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Family Geometridae » Geometrinae
Wingspan 30-40 mm.
Flight Period Throughout Britain, and flying in July and August, it is nocturnal and comes to light. One generation. June-Aug.
Description The 'daggers' get their English names from the black dagger-like markings on the forewings. This moth is almost impossible to tell by the markings alone from the Dark Dagger (A. tridens), and reference usually has to be made to the genitalia for confirmation. Caution should be taken if only a field record as Acronita psi / tridens
They can however be distinguised as caterpillars so rearing is another way to be absolute
Acronita psi / tridens
Habitat It inhabits woods, heaths and moors, .