Teleutias akratonos Montealegre-Z. & Morris, 1999

(1 male recorded) The song of the holotype male was recorded at 24°C. With the unaided ear his call was audible as a quick zip, less than 1 second in duration, too high pitched to suggest musicality, but not noisy: one can detect a pulse infrastructure. The pure tone nature of the pulse becomes apparent during slowing on a tape recorder and is of course evident in the waveform (Fig. 37C).

This male made 51 chirps (calls) in about 2 min 20 s:a chirp period of about 2.8 s. Chirps were given in groups of 24, most commonly 3. Chirp period within bouts was 0.65 s.

There are always five major pulses in a chirp. (ignoring the odd short break). Sometimes a very brief low amplitude short (sixth) pulse precedes. There is a characteristic lengthened silent interval with a mean duration of 22.6 ms between the first 3 and the last two pulses (Fig. 37 A,B). Pulses are about 8-9 ms long with a period near 17 ms.

The sound spectrum is a narrow peak centered at 21.9 kHz; it is extremely high-Q (Fig. 37D). There is no significant sound energy from 25 kHz to 100 kHz. The nearest sound energy is more than 30 dB down from the carrier peak. But among other low harmonies there is a peak consistently at 11 kHz, (Fig. 37D), suggesting that the carrier of this insect is the first harmonic of an 11 kHz fundamental. [1]

Références