It's a moth. I think it's probably an adult squash vine borer (Melittia satyriniformis). They're pretty common once the weather gets warm (as you've noticed if you've ever grown any squashes).

Yes, it definitely looks like a squash borer moth. In my garden they're an enemy, as they lay eggs on my zuchinni, and then the larvae hatch and bore into the plants. Watch your squash plants if you have any!

You know, my first thought WAS squash borer...but I can't remember why I discounted that right away...maybe I just forgot, lol!

I do have one squash plant, in a container on my deck. I'll be sure to watch the plant, and clean off the undersides of the vines. I've heard you can wrap the vines with old pantyhose to foil the borers...any truth to this?

Thanks!

I'm not sure if that would work or not. I could see it either way, depending on the particular mechanics of how the female lays her eggs, but I don't know those mechanics.