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 of the earwigs is the Saint Helena earwig ("Labidura herculeana"), which is up to in length. There are no recent records of this species and it is generally considered extinct. The largest certainly living species is the Australian giant earwig ("Titanolabis colossea"), which is about long.