A distinctive moth that has little variation, freshly emerged individuals often have a violet tint. The name 'streamer' refers to the black marking streaming from the leading edge.
The caterpillars can be found between May and July before spending the winter as a pupa, in a cocoon in loose earth.
Sometimes found during the day resting on fence posts, the adult moth is usually encountered from dusk and is attracted to light.
Flies from late March to May in one generation.