157 Heliozela hammoniella
(Sorhagen, 1885)Wingspan c. 6mm.
Distributed in England and Wales north to Cumbria, this tiny leaf-mining species is locally common.
In July and August, the larva mines the leaves of birch (Betula), preferrng young trees, and begins its life inside a twig, then as it grows, it eventually entes a leaf, forming a gallery mine before cutting out an oval case in which to pupate.
The moths fly in May and June.