Identification
Flies in late afternoon.
Life cycle
Larvae present July-April, adults May-July
Larval foodplants
Birch and alder species.
History 1860-2010
First for Dumfries & Galloway was of a pupa found at the Black Steps, Glen Trool (VC73) on 30th May 2017, which emerged on 12th June 2017.