This is a good time of year to look for leaf mines on fallen oak leaves. An interesting feature is the way green 'islands' remain around the mines when the leaves are otherwise turning brown. This makes finding them much easier! The two mines on the right have been made by one of the commonest species, Ectoedemia subbimaculella. It feeds in a blotch with a slit in lower epidermis. The mine of Ectoedemia heringi is similar but without the slit. I also find it less frequently than subbimaculella.