pars stridens
Homology Weekly: Stridulatory Organ
Pars stridens (in yellow) on the fourth abdominal tergite in a Pachycondyla villosa worker (Scanning Electron Micrograph, Roberto Keller/AMNH)
Many insects produce chirping sounds by rubbing body parts against each other in a behavior know as stridulation. The structures involved have modifications specialized for this purpose thus forming a stridulatory organ.
