Mosquito
Mosquitoes of the genus "Toxorhynchites" never drink blood. This genus includes the largest extant mosquitoes, the larvae of which prey on the larvae of other mosquitoes. These mosquito eaters have been used in the past as mosquito control agents, with varying success.
Megascolia
Megascolia is a genus of large solitary wasps from the family Scoliidae, the species classified under "Megascolia" include some of the world's largest wasps. They are parasitoids of large Scarabeid beetles such as the European rhinoceros beetle "Oryctes nasicornis" and Atlas beetle "Chalcosoma atlas".