Marbled Minor Oligia strigilis
Wingspan 22-25 mm.
One of a complex of three species, which can only be reliably separated by dissection of the genitalia. The other two species are Tawny Marbled Minor (O. latruncula) and Rufous Minor (O. versicolor).
The identification of this group is further complicated by the relative frequency of melanic specimens.
Of the three, this is the commonest and most widespread, occurring throughout most of Britain, and flying from May to July.
The larvae feed in the roots and stems of a number of grasses.