anyone have experience with black bees?

Most bees are non-agressive. You may have some type of wasp. They typically start acting up when you get whithin 6-8feet of their nest. If you can locate it, night is generally a safer time to approach it. Boiling water poured down the main entrance will kill most of them with the added plus of none coming out of the hole to sting you. Otherwise a hornet/wasp killing spray with a 20 ft reach and saturate the heck out of it.

Those probably aren't actually bees, but some sort of wasp. My husband had a rather nasty run in with an unseen hive of them about 10 years ago, and he hasn't even come close to forgetting about it. If the nest is somewhere out of the way, I'd leave them alone, and maybe post something there so you or your visitors won't tread too close. But if it is near walkways (ours was on the side of a walkway and our vibrations from walking over the hives made them mad, I think, and came buzzing from the ground...it was terrifying, like something out of some bad sci fi flick)) I would say maybe try and get rid of them somehow. I try and live with just about everything, but when they are attacking me I can't deal with that. If I had known they were there I would have put the walkway somewhere else, but since they were unseen until then, how was I supposed to know?

The stings were like fire but thankfully neither of us were allergic, and we got over it quick enough, but it still sucked.