3. Mimallygus lacteinervis (Kirschbaum, 1868)

Figs 8–15.

MATERIAL. Moscow Oblast, Mytishchi, on cultivated Salix purpurea in the park, 22.VII.2022, signals of three males recorded at 27 °C .

SIGNALS. The male calling signal is a variable complex phrase lasting for about 10–30 s (Figs 8–11). The phrase begins with a sequence of syllables with a variable and indistinct pattern, repeating with a period of 0.9– 2.0 s (usually about 1 s) (Fig. 12). As a rule, the amplitude of this sequence is significantly lower than that of the main part of the signal (Figs 8–9, 11), although sometimes it can be equal to it (Fig. 10). The middle part of the phrase consists of alternating longer and shorter syllables lasting approximately for 550–580 ms and 250–270 ms, respectively (Figs 13, 15). Syllables of both types have similar temporal patterns. Normally, they begin with an amplitude burst, followed by a long low-amplitude part; sometimes its amplitude gradually increases towards the end. The phrase usually ends with several syllables similar in temporal pattern to those in the middle part, but having lower amplitude and lasting for 570–700 ms (Fig. 14).

The above description concerns phrases with a typical pattern. Often the initial and/or final parts of a phrase can be almost completely reduced (Figs 10–11) and the middle part includes only 7–8 syllables (Fig. 10). The ratio of amplitudes of different parts of a syllable can be different from that described above, sometimes additional short component presents between main syllables, etc.; such an atypical syllable followed by an additional short component is shown in Fig. 15 (second half of the oscillogram).

REMARKS. This Western European species was only recently recorded from Russia [Tishechkin, 2022b].