The larvae mine the leaves of Lamium (e.g. white dead-nettle) as well as Yellow Archangel and Ground-ivy, creating a large pale blotch at the edge of the leaf.  A short preceding corridor is over-run by the later blotch.

See the National Agromyzidae Recording Scheme website for further details of the mine, puparium and adult insect

On dead-nettle or yellow archangel, the mine may look like mines of  Amauromyza labiatarum or Amauromyza morionella, but the corridor section of these two species is much longer and usually more obvious.

(ref.: Warrington, B.P. (2023). Agromyza flavipennis. Accessed at https://agromyzidae.co.uk/species/agromyzidae/agromyzinae/agromyza/agromyza-flavipennis/ on 10/12/2023)

Leaf-mine Adult

Provide backlit photographs of the whole leaf-mine in the leaf, and note the host plant

Click on the 'further details' link in the 'Description' section above.  Then click on the Phenology tab which will provide phenology details for both adult and larval stages.

Nationally Scarce A

Warrington, B. P. 2022. A provisional review of the status of Agromyzidae in Great Britain & Northern Ireland

Status in Leicestershire and Rutland not known.