Poecilanthrax willistoni
 Poecilanthrax willistoni Williston's bee fly or sand dune bee fly is a member of the Bombyliidae insect family. This family includes the bee flies true flies that have developed Batesian mimicry characteristics to avoid predators. That is they look like bees because that helps them avoid bee-wary predators but they lack stingers.P. willistoni also has larvae that act as parasitoids on other insect species.