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Solitary and/or predatory bees

This might be a question in the wrong place but I have no image of this particular insect for ID. I live in Wayne County, North Carolina and, while walking my dog, I have seen what, to me, looks like a large black bee flying around. I have stood and watched it and found out that it is actually "hawking" for smaller insects. Typically, even though I have my camera with me, it won't settle anywhere so all I have is a picture in my mind of a large black bee, with a body diameter around 10-20mm. Due to the speed of its flight, all I can see is a shiny, black ball moving back and forth across the wind, obviously hunting by sight, and occasionally darting off to try and catch a smaller flying insect. A failure to catch anything and it is back on station moving back and forth across the wind, hunting again.

Does my description spark any ideas in anybody's mind?

Thanks to everyone who has pu
Thanks to everyone who has pushed names at me and my thick head. ;o)
I did get a view of one of these insects from the side yesterday and was able to see some yellow fur on it. I still am not able to ID it properly since I have yet to find one settled anywhere. However, Robber Fly is probably right and I may have to try and capture one somehow and get it into my kiddies bug box for a photo.

No predators
There are no known predatory bees in North America. Most bees eat pollen. Three species of Trigona from Central and South America eat carrion.

Bee Mimic Flower Fly
Maybe Eristalis anthophorina or E. flavipes. Also Mallota bautias or M. posticata. All are flower flies (Syrphidae).

Also you could try robberflies (Asilidae), Laphria species.

All of them look like bumblebees with some 'fur' on them.

You didn't specify that it looked like a bumblebee, so for other black bees, try some of the other robberflies without fur.

 
Thanks Lee, I think not a Rob
Thanks Lee, I think not a Robber Fly because the body of the ones I have seen is, perhaps, bumblebee like in that it is ball shaped and not very elongated. I am only seeing these from downwind and hence only seeing it from the back. The image in my mind is, as I said, a shiny black ball around 10-20mm in diameter, so quite large. Probably I should have mentioned bumblebee shaped although the size of those in question appear to be larger than bumblebees that I know.

 
Not all Robber Flies are elongated :)

 
Another possibility...
...is that it was not actually attacking other insects, but merely investigating them. A male Carpenter Bee will hover in place, then dart out to investigate passing insects that may be potential mates (or rivals).

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