Where are the hearing organs located on crickets and katydids?

In crickets and katydids, the primary hearing organs, known as tympanic organs, are located on the first pair of walking legs, specifically on the front tibiae.123

These organs consist of a tympanic membrane—a thin area of cuticle—that vibrates in response to sound waves. This vibration is detected by specialized cells called scolophores, which then transmit nerve impulses to the central nervous system. While these tympanal structures are the most prominent, many orthopterans also possess less conspicuous auditory receptors, such as sensory hairs on various body parts and Johnston’s organ located on the antennae.24