Kybos niveicolor Zachvatkin, 1953

Figs 9, 33, 42–43, 51, 54, 60, 74–76

Kybos niveicolor Zachvatkin, 1953: 239

Empoasca (Kybos) niveicolor niveicolor Dworakowska, 1976: 440

Description. Live specimens white or greenish white, dry ones yellowish white, sometimes with slight greenish tinge (Fig. 9).

Dorsal apodemes short, ventral apodemes about 1.6–1.7 times as long as wide at base, narrow, parallel-sided, separated by narrow notch (Fig. 33). Genitalia almost same as in K. montanus and K. oshanini . Aedeagus without lateral processes (Figs 42–43). Style with numerous long setae and serrated falcate apical part (Fig. 51). Pygofer appendages narrow (Fig. 54). Anal collar appendages narrow, falcate (Fig. 60).

Hosts. Populus alba . P. nivea and P. bolleana, listed as food plants in the original description (Zachvatkin, 1953b), are now considered synonyms of P. alba (Skvortsov, 1972) .

Calling signal. Signals of five males from Kyrgyzstan ( Arkyt Village, Chatkal Range, West Tien Shan, on P. alba, 16. VII. 2011, recording at 22 oC) were investigated .

Calling signal is generally the same as in K. oshanini and K. montanus . It consists of 3–6 high-amplitude pulses, following each other with a period of 320–520 ms; sometimes, the pulse repetition period increases towards the end of a signal (Figs 74–75). Pulse duration averages 30–45 ms (Fig. 76). Unlike two above-mentioned species, in K. niveicolor, additional low-amplitude pulses are absent between the main high-amplitude ones. As a result, the signal is not a phrase, i.e. a sequence of syllables, but a simple pulse sequence.

Distribution. Widespread in southern and southeastern Kazakhstan, Kyrgyzstan, Uzbekistan, and Tajikistan; also, was found in Xinjian, China (Mitjaev, 2002).