The continuous transverse lines would key this as Psilocorsis cryptolechiella. The lines are more broken into smaller segments for quercicella.

Thank you for catching this. They are in my files that way now. Jason Dombroski identified one he collected from here.

Oops, I guess I will have to take this back to Genus. I had sent an e-mail to Terry Harrison asking him to look at this one prior to your answer, and he just told me he cannot take it to species. So, "when in doubt", leave it at Genus unless you are more experienced in this Genus than Terry is. I DO, however, notice the dark area on almost all of the Oak Leaftier pictures which would make me lean toward "our" ID. It looks like this one might give us more trouble , but I don't see any discal spots on mine and mine has that very black fringe.

I need to review all mine, this winter.

Many thanks RLZ!

Thank you Kyhl. I am sorry you could not help me beyond Genus.