Hymenoptera (sub-order Symphyta) Tenthredinidae - Heterarthrinae Fenusa dohrnii Leaf mine on Alnus glutinosa, Common Alder There can be multiple mines in a leaf, the larvae with pale legs. Mine is vacated before pupation Similar: Heterarthrus vagans; larva with dark legs, pupation within mine

Fenusa dohrnii
Wimborne, Dorset. September 2015