I noticed a small, pale moth flitting repeatedly around a patch of taller plants in a grassy old field just before sunset this evening; very restless, flying in semi-circular pattern, alighting only momentarily without even ceasing to flutter its wings, then taking off again... as if searching for something. It finally flew up onto the underside of a leaf of cup-plant (Silphium perfoliatum) and out of my sight. When I crouched down, I found it mating with another moth. The one I tracked is the spotless-winged one that is facing down in the photo (male?); the other (upright with spotted wings, female?) was evidently already there. I wonder if the male had scented the female, thus accounting for its "searching" flight? They parted ways after about two minutes; the spotted-wing one remaining stationary while the spotless-winged one flew away.