This is one of several very similar Coleophora species which can only reliably be distinguished by genital dissection.
The adults have a metallic bronzy-green/purple sheen at the apex of forewing.
Although both this species and C. frischella are on the British list, C. frischella has only been recorded a handful of times from the west of Britain.
Rough grass and roadside verges.
There are no records in the system yet in Bulgaria.