While I have been recovering from hip revision, I did some photography among the daisies in the back yard.  I have this wonderful macro lens which does a 1x1 magnification, and here are some of the results. The size of these insects can be told by the fact that most of the daisy centers are about one inch across.

I think he is calles a sweat bee, about the size of this B.

This is one ugly fly, about the size of a large grape