I assume some sort of wood borer, as we were grilling that night.
Thought this was an Eastern comma, and maybe it is, but the wings have an aberrant spot, if so.
(After some research - it's a question mark).
Feeding on a (cultivated) swamp milkweed plant.
I would REALLY like an ID for this vine. The white flowers draw butterflies like mad. The plant is host to both Oleander aphids and milkweed tussock moth caterpillars, which feed on dogbane (that's why I stuck it in that family). The vine is growing on a lilac bush, so ignore the lilac leaves.
No broccoli for me. :\
Porch light. Approx 3/4 inch wingspan.
My swamp milkweed was very popular this year!