Stridulation is the production of sounds by rubbing two parts of the body together; this mechanism is best known in
crickets,
grasshoppers, and
cicadas. Larval
Lucanidae,
Passalidae[?], and
Geotrupidae[?] also stridulate, rubbing a series of ridges on the coxa of the middle legs with a scraper on the trochanter of the hind leg.