Trogus is a species of parasitic wasp belonging to the family Ichneumonidae. These insects are typically small in size, ranging from 5 to 15 millimeters in length. Trogus wasps are known for their distinctive black and yellow coloration, with a slender body and long antennae. They are parasitoids, meaning they lay their eggs on or inside other insects, particularly caterpillars, which serve as hosts for their developing larvae.