The females lay eggs from April to June. Usually they produce 20 to 30 eggs that they lay in bark crevices and in the vicinity of the bark of pine trees running tunnel of the bark beetle. The pink-colored larvae hatch after about a week and live under the bark, where they are predators of bark beetle larvae, eggs and pupae, but also feed on other insects living under the bark. In pursuit of their prey, they are also very quick and very skilled at moving the bark beetle corridors, where they can run backwards.