The fly Amauromyza labiatarum has larvae which mine the leaves of various plants including Dead-nettles and Woundworts producing a mine with a narrow gallery leading to a largish blotch on the upper surface. Frass is green and indistinct in the gallery - small grains may be seen at the gallery edge. The mines are recorded more frequently than the adult flies.
Wherever the larval foodplants occur.
The mines can be seen early summer and early autumn.
Larval foodplants include Prunella (Self Heal), Stachys (Woundwort), Lamium (Dead-nettle), Glechoma (Ground Ivy), Galeopsis (Hemp-nettle), Ballota (Horehound), Teucrium (Germander/Wood Sage), Lamiastrum (Yellow Archangel), Ajuga (Bugle), Verbena officinalis (Vervain).
Widespread and locally frequent in southern Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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