General comments:
Increasingly local resident. Declining. Species of Conservation Concern.

Woodland features at almost all the sites where we have reports of this moth, which is absent from many garden lists. My suggestion (Plant, 1993) that the moth was in general decline across the entire London Area, which includes the southern third of Hertfordshire, is not contradicted by the present results and the map shows clearly a number of sites from which it has not been recorded for some time. Within Middlesex, the woods of the northern boundary area support most records but the moth seems to have been lost from much of this zone.

Recorded in 27 (66%) of 41 10k Squares.
First Recorded in 1887.
Last Recorded in 2021.