Bioacoustics. The song (Fig. 32, 33) of Cohnia andena comb. nov. consists of short series of paired polysyllabic echemes audible by the unaided ear. Such paired echemes are repeated 3–4 times in 3–4 sec, each pair of echemes lasts for 0.35 sec and is separated from the following by an interval of 1.9–2.4 sec. Echemes are composed by 4–8 dyplosyllables of different intensity and last for 0.03–0.05 sec. Diplosyllables consist of hemisyllables apparently equal in length (about 0.001 sec).
This song structure is different from that observed in Dichopetala s. str., confirming the generic diversity of Cohnia g. nov.
Singing activity was observed in laboratory conditions only during a restricted time in the morning, approximately between 9 and 11 a.m., with natural light. All the song emitted by males in different conditions, alone or with other male or female specimens in the same cage, were similar, therefore the presence of other individuals seems to have no effects on song.
These males were probably young singers, since some nymphs were observed in the population examined and the first song was emitted by captive males seven days after capture. [1]
Cohnia andeana
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