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.
List of largest insects
The largest wasp is probably the so-called tarantula hawk species "Pepsis pulszkyi", at up to long and wingspan, although many other "Pepsis" species approach a similar size. The giant scoliid wasp "Megascolia procer" may rival the tarantula hawks in weight, if not length and wingspan, and the Asian giant hornet "Vespa mandarinia" can reach a body length of up to 2 in.