Aphids (black) on tomato plants! Will leave alone.

Wow, not sure how these escaped my attention -- a bunch of what I think are aphids (many adults, black with wings, but they don't fly around, they just hang out on the plant) are all over one branch of the SW-most tomato in the central bed, and they're scattered around in lower numbers on other tomato plants too.

I think I'll try just leaving them and see how it goes.

First time I've had these on tomatoes, I think.