Its [[tymbal]] is completely covered with tymbal covering. The tymbal (or timbal) is the corrugated exoskeletal structure used to produce sounds in insects. The call changes with temperature, being correlated with the firing rate of the tymbal nerve. Adults indicate their unpalatability with clicks from their tymbal organs (Simmons and Conner 1996). The sound is produced by a tymbal on each tegula, which covers the forewing. During sound production, the temperature of the tymbal muscles was found to be significantly higher. The abdomen is black between the tymbal covers and red-brown and black more posteriorly. This causes the tymbal to buckle and results in the emission of an ultrasonic pulse. The most distinctive feature of the subfamily is a tymbal organ on the metathorax. Muscle contraction rapidly deforms the tymbal membrane, emitting several different types of sounds.