Elachista cahorsensis

Elachista cahorsensis is a moth of the family Elachistidae. It is found from Great Britain, Ireland and Germany to the Pyrenees.

The wingspan is about 8 mm.

The larvae feed on red fescue (Festuca rubra) mining the leaves. Larvae can be found in July and again from September to November. They are pale grey with a semi-transparent, reddish brown head.