To bee or not to bee ?

Yesterday's buddleia was, this evening, quite busy with bees and other winged insects. There was an enormous bumble bee but he insisted on hiding from the camera so I had to make do with this one.
The extra pics are of a fly of some sort but the depth of field was not sufficient to get the whole insect in focus so there is one shot of his head with its huge eyes and another of his rear end and beautiful wings.