Black-veined Moth Siona lineata
Wingspan 35-40 mm.
A protected species, restricted to a handful of locations in south-east Kent, it was formerly also found in some other southern counties.
It flies during the day, especially in sunshine, and frequents rough downland, pastures and similar grassy places.
Its foodplants in the wild are not well documented, but the species is believed to feed on wild herbs, for example marjoram (Origanium).