Bee-like Robberfly

The Japanese Beetles on the Butterfly Bush were all piled up in one spot when I noticed this bee on the back side of the bush with a beetle. The bee stayed on a leaf with the beetle for several minutes then dropped it and washed its face (or maybe it was licking its chops) then flew off and, within a matter of seconds, returned with a second beetle. I continued photographing it until I was afraid it might get aggravated by my presence. Normally I would've just thought this was a bumble bee except for this behavior.