The larva of Athalia liberta [1, 2], a Sawfly (SYMPHYTA) on Garlic mustard (Alliara petiolata), a host plant of this species.

References
1 Nederlands Soortenregister2 Sawflies.org.uk, Spreadsheet of larval foodplants
The larva of Athalia liberta [1, 2], a Sawfly (SYMPHYTA) on Garlic mustard (Alliara petiolata), a host plant of this species.
References
1 Nederlands Soortenregister