New images are at the beginning.

I have read that there are about 1,000 species of robber flies in North America! No wonder I have trouble identifying them to species. I find this family of flies quite remarkable, particularly the astonishingly bumblebee-like members,usually in the Genus Laphria. Robber flies are exceptionally variable and range from enormous specimens (Proctacanthus) to tiny little midge-like flies (Holcocephala abdominalis). You will often see robber flies sitting on perches waiting for some hapless victim to pass by, and when they do, they will rush out, nab them and take them back to their perch. They quickly subdue their prey, even the big wasps that the very large robber flies take. They excel as predators as the following photos show, for many depict the robber fly with prey.

Robber Flies have tufts of hair on their face, called a mystax, and this is characteristic of the family, making them pretty easy to identify, at least to family (Asilidae).