There are several of these bees flying about rather busily and giving chase to one another around a small section of our yard where a patch of African violets had bloomed earlier in the season. I noticed an entry point to an underground den in the immediate vicinity but not much more than the occasional bee is coming in or going out of it. In the late afternoon such as when I photographed this specimen, they fly around a bit and eventually settle on a stalk or stem and then hunch up and go completely still unless disturbed, then they will fly again. Their eyes are a greenish hue. From my comparison searching online the closest they seem to be in appearance are the long-horned digger bee, but that's just a total layman's guess.