Wingspan 15-19 mm.
The smallest of our Ethmia species, this is a local moth, occurring in England mainly in the east and south-east.
Flying between May and July, the adults are mostly nocturnal, and are attracted to light, but are sometimes seen flying in sunshine.
The caterpillars live in a silken web and feed on the foliage of comfrey (Symphytum spp.) and lungwort (Pulmonaria officinalis).