Last modified: Aug. 25, 2021, 5:05 p.m.
A very rare and species in Belgium, recorded for the first time in 2021 in WV.
The "glass cells" (translucent small areas near the forewing base) characterize this species , identification with a genitalia preparation is therefore not necessary. However, these glass cells become clearly visible only when light falls from behind through the wings, especially in prepared individuals, but this character is hard to see in live animals in resting position.
The larva lives in vomit balls in owl nests and in bird nests. It flies at night and come to light.
The adults are on the wing in May and June.