Black bees are somewhat common around our farm, and they were around before I started beekeeping. I can't say where the black bees are coming from, or what genetics are in them, but I can tell you where they are not coming from. I don't have any in my hives, and there are not any apiaries currently within 8 miles of my apiary.
This it was taken in spring when I was first getting started with no honey to rob. They were working the dandelions over pretty good too.
So my assumption is that it is from a feral colony somewhere not more than a mile or so as there where plenty of pollen and nectar sources available at the time this was taken. It would be great if I could find the colony and see what percentage are black. My guess it that I would find a mix of colors, with good genetics. Finding the queen would prove interesting I'm sure. Maybe I will be able to find this mystical source someday!
Yep, that is what they look like