Distribution and Abundance: Fairly common to common.

Primary Habitat: Wetland, woodland and hedgerows. 

Flight Period: Records extend from May to September indicating a second brood in some years.

Observations: The adults of Dark Dagger (A. tridens) and Grey Dagger (A. psi) are virtually identical and show a similar range of variation. Unless examination of genitalia is performed, or the moths have been reared, due to the larva being readily identifiable, please record as Dark/Grey Dagger agg., a combination of the two species.

First Record: 1863, Smith.