Barkfly nymph (Loensia variegata) on oak log - 1

Notice how the debris is even stuck to the eyes -

Barkfly nymph (Loensia variegata) on oak log - 2

In this final image you can see more clearly the developing wings, which in the adults will end up much longer than the body.

Barkfly nymph (Loensia variegata) on oak log - 3