Recording method

Adults often rest on tree trunks.

Identification

The mine has a slit in the lower epidermis to allow the frass to fall out (occasionally the slit is absent).

Life cycle

Mines: October-November.  Adults: June-July.

Larval foodplants

Oak species.

History

The first for Dumfries & Galloway was of leaf mines found on Quercus at Langholm, Dumfriesshire, on 11th October 1952 by E. C. Pelham-Clinton, who the next day found the first for Kirkcudbrightshire that was also of leaf-mines found on Quercus at Caulkerbush on 12th October 1952.