A new stridulatory structure for Carabidae, based on morphology and acoustics of the Southern Hemisphere genus Gonogenia, is described. Sound is produced by abdomino–elytral movement between the surfaces of two projections on the inner lateral surface of the elytra (pars stridens) against the surfaces of two opposing projections from the outer edges of the first abdominal sternite (plectrum). While both males and females have stridulatory organs, only males were recorded producing signals. Signals were broad spectrum extending into ultrasound frequency ranges (3.5–75 kHz). Signals were produced continually by male Gonogenia tabida individuals while mobile in a localized area and likely represent a form of intraspecific communication, due to absence of observed potential disturbance stimuli
beetle, Carabidae, Gonogenia, acoustics, ultrasound, stridulation, abdomino–elytral