A couple for you . .
I love your nickname. I know (by Internet) a retired priest who’s nickname is the same because he does bugs for fun too! We live in western South Dakota just east of Rapid City, NOT in the Black Hills. I have two for you, one I think I have identified from your web site as metallic green bees, pollinating our sunflowers. They were everywhere when our sunflowers were in full spate! The other is a mystery – the closest I have gotten is that by “insect definitions” (which I know very little about) is that this is some kind of fly because it only has one pair of wings. There are actually two pictures taken on different days. Both were sucking on early sunflowers along with some (YOW!) yellowjacket wasps which I manged to avoid, phew! The closest on your site was a Bee Fly, and these were definitely not eating bees! These pretty much ignored me as when I took these macros, they did not move! One appears to onlt have on set of legs, but the second picture reveals three pairs. Bless you for a fantasic site, and not just for kids!!!
Diane in South Dakota
You sent us three copies of the Metallic Sweat Bees in the genus Agapostemon. The photo is wonderful.