A tiny moth, having a wingspan of only around 6 mm, with quite a coarsely-scaled appearance.
Leafmine occurs on St John's Wort http://www.leafmines.co.uk/html/Lepidoptera/E.septembrella.htm
Wherever the larval foodplant, St. John's-wort (Hypericum), occurs.
The species has two generations, on the wing in May and June, and again in August.
The larvae feed in a mine in a leaf of St. John's-wort (Hypericum), at first in a narrow gallery, later becoming a blotch mine.
Fairly frequent in England and Wales. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as common.
It appears to be uncommon or under recorded in Leicestershire and Rutland, where there are few records. L&R Moth Group status = D (rare or rarely recorded).
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015