Last modified: April 20, 2020, 7:13 p.m.
A very rarely seen species in Belgium.
The fore wings are ochreous yellow with little black dots all over the wing. The wings are sickle shaped, there are also many light longitudinal lines.
The antennae are thickened at the base.
See also bladmineerders.be.
Caterpillars are not distinguishable of those of C. lixella due to many misidentifications in the past.
The case is flattened, at first whitish yellow changing rather quickly to brown. Cases are 13–17 mm.
The mouth angle is about 30°.
Young larvae live on several species of Lamiaceae, making their first case from the leaves. At first they eat flowers and seeds of the foodplant. Just before winter they switch to grasses, mining them.
Larvae live from October till May.
There has been a big confusion with C. lixella; therefore all the information in the old literature should be treated with caution.
The adults fly in one generation a year from May till July.