In some ways, the Brown Mantidfly is a natural enemy of the Wolf Spider. After hatching from their eggs, Brown Mantidfly larvae eventually make their way into the female Wolf Spider's egg sac during its construction by the mother. Once inside, the Mantidfly larvae begin feasting on the spider eggs. The adult Brown Mantidflies emerge from the spider's egg sac once they have fully matured.
Brown Mantidflies are not usually seen, but when they are, they leave an impression. They are most active from spring through summer and prefer marshes, grasslands, forests and open fields.