(Zetterstedt, 1839)[Synonyms: purpurella, haworthi]
This spring-flying species is probably overlooked, but is generally well distributed throughout much of mainland Britain.
Like several of its congeners, the larval foodplant is birch (Betula), the larvae creating a blotch mine in the leaves during May. The larval signs of this species can often be distinguished as they have a habit of feeding gregariously, with several larvae in a single blotch. The larvae are also generally smaller and whiter than related species.
The adults fly around the foodplants during April, but are not often seen.
See also: Leafmine (British Leaf Mining Fauna)