Acantheucoeal species, USDA Buffington
This is picture 1 from a 12 picture series by Matt Buffington at the USDA Parastitic Hymentoptera group at the Smithsonian. Matt's group uses a system very similar to ours to photograph and stack this super tiny wasp. Perhaps one of the most spectacular of the eucoiline wasps out there, species of Acantheucoela are native to South America. Acantheucoeal attack muscomorph flies in various habitats, but are rarely collected.