Fig. 15. Diagrammatic representation of the shape of the envelope of the different types of song pulses produced by Teleogryllus oceanicus. The lower horizontal scale shows the number of teeth along the length of the file. Each tooth equates with one cycle of sound in each pulse. The upper scale shows the distance along the file corresponding to particular file teeth. The long pulses of the chirp consist of approximately 180 cycles of sound and are assumed to be produced by the middle 180 teeth of the file. The first of the paired short pulses of the trill (blue) appears from Fig. 6C to be produced from a more posterior part of the file than the second of the paired pulses (red). The vertical line at tooth number 170, 2.2 mm from the posterior end of the file, is the point at which excitation of the right file produces maximal sound radiation by the harp (see Fig. 11). The horizontal arrow shows the direction of the wing-closing movement.

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