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.
Parischnogaster alternata
Similar to other Stenogastrinae, the major predators of the Black hover wasps are ants, ichneumon flies, and "Vespa" hornets, specifically "Vespula tropica "(which has also been found to be a major predator of a number of "Parischnogaster" species, such as Parischnogaster mellyi and Parischnogaster nigricans serrei). Hornets often visit the nests of "P. alternata" and extract pupae and large larvae. While the colonies are relatively small, the presence of helpers and co-foundresses contributes to active defense tactics. Females may attempt to attack hornets in flight by stinging. Through cooperative defense, some residents drive away the hornets while the wasps fall from the nest in order to save the adult individuals. Nonetheless, evolution has decreased active defense mechanisms of "P. alternata." Thus, the attempts to attack predators often have little to no effect.