Dasyscelus normalis Brunner von Wattenwyl, 1895

Fig. 29C, D; 31A

Distribution: Argentina: Buenos Aires; Brazil: Paraná; Paraguay: Paraguarí.

New record for Brazil and for the Paraná State.

Comments: The collected specimens have an interesting colouration pattern, when alive they are greyish with some greenish areas or spots, and with ventral edge of abdomen light brown. They camouflage on mosses and lichens, where they can be found and collected.

Bioacoustics (Fig. 30D–F): Males produce echemes with small duration and quite constant amplitude. Each echeme is composed by 22 to 28 syllables with a moderate increasing of intensity during the sound production. A remarkable characteristic of the song of the species is that the dominant frequency changes along the stridulation: the dominant frequency is smaller at the beginning and at the end of the syllable than in the middle of the syllable, when the highest frequency is reached.

Dominant frequency: 19.6 ± 2.2 kHz.

Bandwidth: 6.9 ± 0.8 kHz.

Duration: Syllable: 0.3 ± 0.02 s.

Mute interval: Syllable: 14.2 ± 2.2 s.