Another Dion skipper (observation https://www.inaturalist.org/observations/189689470) at this location suggests this individual is probably also E. dion. But, the markings on the ventral wing look a bit different to me, so more input is welcome.
Devil's Punch-Bowl trail; exact location not recorded. A male was recorded in the same general are about an hour earlier (https://inaturalist.ca/observations/88950679)