I guess this is a week for LBBs. If you are a birder you know the joke. LBB is "little brown bird," always a safe name for those unknowns in the shadows. But, it could also be "little brown butterfly." Here's a really common one, but I learned some things by looking it up.
I already knew it was a Satyr Butterfly (now a sub-family of the Nymphalidae- brush-footed butterflies- the taxonomy is probably evolving as you read these words- DNA has changed everything). As a group they are brown butterflies with eyespots on their wings. The field is just filled with them right now. And it's no wonder, because they really like the nectar of the Queen Anne's Lace (wild carrot), which are in full bloom.
Of course, I was hoping it might be something a bit unusual, but it's just the Common Wood Nymph, Cercyonis pegala. Other common names are Grayling, Blue-eyed Grayling, and the Goggle Eye. What I didn't know is that there is a lot of variation, even in this one species. But the two spots on the fore-wing with none on the back side (dorsal surface) of the hind wing is usual.
I also didn't know that there are about 15 species of Satyrs in North America, and a lot of regional variation in those. So, although I'm not surprised that this is the commonest, I suppose that I might see another kind some day.
I didn't get a good picture of the ventral side. I'll keep trying.
Tomorrow morning is the swim, unless it gets rained out.