I think this thread too a turn a while back and people have been posting about black bees/carpenter bees in general, not necessarily the picture in the OP.
Repeat from my post #9:
I checked out your photo and I don't see any "black" honey bees, or any insect that looks like a bee and is black. Could you please be more specific as to the location of these "black" honey bees. Thank you.
Okay, I magnified the image and took a very close look. All I see are a few bees, inside the feeder compartment that had been a little bit dampened by sugar syrup, and none that are black. You should get yourself a good look at some of the Apis mellifera mellifera, now those are truly black honey bees.
Joseph Clemens -- Website