Last modified: Feb. 17, 2020, 2:34 p.m.
A very rare and local species in Belgium, hitherto only known from the extreme south of the country. Nowadays not often observed.
The adults fly usually in one generation a year; during June and July. When conditions are favourable, a small partial second generation may occur from August till September filled up with occasionally migrants. They are active by day and night and come to light.
The larva lives in the stems of Ononis. Hibernates as as a small larva and pupates in a loose spinning at the base of the food plant.