A not so common species in Belgium.

The larva lives on Carpinus betulus. It makes a long mine between two veins on the underside of the leaf, and is strongly arched. Pupation in a loose brown  cocoon at one end of the mine. The pupa of the second generation hibernates.

The adults fly in two generations a year: during May and from late July till August.

ID mine: underside of the leaf, long and narrow between two veins, but not usually extending to the edge of the leaf. Lower epidermis with one large central fold, contracting the mine so that it forms a tube, upper epidermis with the parenchyma almost totally consumed.