Kybos niveicolor Zachvatkin, 1953

Tishechkin, Dmitri Yu., 2024, Leafhoppers of the genus Kybos Fieber, 1866 (Hemiptera: Cicadellidae: Typhlocybinae: Empoascini) in Kyrgyzstan, Zootaxa 5496 (1), pp. 89-100 : 93-95

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).

Figures

FIGURES 1–12. Kybos spp., dorsal habitus. 1–4—K. montanus (1–2—specimens from Inner Tien Shan, 3—specimen from West Tien Shan, 4—specimen from Alai Range); 5–8—K. oshanini (5—specimen from the type locality of K. mesasiatica in Uzbekistan, 6—specimen from Shekaftar, the northern edge of the Fergana Valley, 7—specimen from the Ili River basin, Kazakhstan, 8—specimen from the type locality of K. oshanini in Moscow Oblast); 9—K. niveicolor; 10—K. auricillatus; 11—K. populi; 12—K. virgator.

FIGURES 13–37. Kybos spp., abdominal apodemes. 13–16—K. montanus (13–14—dorsal apodemes, 15–16—ventral apodemes); 17–32—K. oshanini (17–24—dorsal apodemes, 25–32—ventral apodemes; 17–20, 25–28—specimens from Shekaftar, the northern edge of the Fergana Valley, 21–22, 29–30—specimens from the same locality in West Tien Shan, 23, 31—specimen from the Ili River basin, Kazakhstan, 24, 32—specimen from the type locality of K. oshanini in Moscow Oblast); 33—K. niveicolor, dorsal and ventral apodemes; 34–35—K. auricillatus (34—dorsal apodemes, 35—ventral apodemes); 36— K. populi, dorsal and ventral apodemes; 37—K. virgator, same.

FIGURES 38–63. Kybos spp., male genitalia. 38–39, 50, 52, 58—K. montanus; 40–41, 53, 59—K. oshanini; 42–43, 51, 54, 60—K. niveicolor; 44–45, 55, 61—K. auricillatus; 46–47, 56, 62—K. populi; 48–49, 57, 63—K. virgator. 38, 40, 42, 44, 46, 48—aedeagus, lateral view, 39, 41, 43, 45, 47, 49—same, dorsal view, 50–51—style, 52–57—pygofer appendage, 58–63—anal collar appendage.

FIGURES 64–78. Oscillograms of male calling signals of Kybos spp. 64–69—K. montanus; 70–73—K. oshanini; 74–76—K. niveicolor; 77–78—K. populi. Faster oscillograms of the parts of signals indicated as “66”, “68”, “72–73”, “76”, and “78” are given under the same numbers.