Wingspan 17-21 mm.
A spectacular day-flying species, with its combination of rufous, white and metallic blue markings and remarkably large labial palps.
It occurs reasonably commonly in England and Wales, inhabiting woodland and marshy places, and flies during May and June.
The larvae feed under bark on rotting wood. It has also been reared from inside sticks of Rubus fruticosus agg. and Corylus avellana (R. J. Heckford).