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
"Arachnacris" katydids and "Tropidacris" grasshoppers reach up to in length and in wingspan, making them the largest by these measurements. The largest "Saga" and "Pseudophyllus" bush crickets are only are a few centimeters smaller.