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.
Hunting wasp
In searching literature for "hunting wasps" it is prudent to include "solitary wasps" in the index terms. The two expressions have been used largely indiscriminately, especially in the very early days of modern entomology. Very few references to "hunting wasps" occur before about 1850, whereas references to "solitary wasps", though not plentiful, are not unusual.