Beewolf
Beewolves (genus Philanthus), also known as bee-hunters or bee-killer wasps, are solitary, predatory wasps, most of which prey on bees, hence their common name. The adult females dig tunnels in the ground for nesting, while the territorial males mark twigs and other objects with pheromones to claim the territory from competing males.
Philanthus gibbosus
The predation habits of the family Crabronidae shed light on the question whether bees or wasps came first. There is evidence that, based on the predation habits of species in the Crabronidae family, bees are a lineage of pollen-collecting wasps that descend directly from a group of predatory wasps in Crabronidae.