Key to species of the genus Kybos of Kyrgyzstan

1. Dorsal abdominal apodemes as long as their width at base or longer (Figs 13–14, 17–24)............................2.

- Dorsal abdominal apodemes are much shorter than their width at base, sometimes are almost undeveloped (Figs 33–34, 36– 37).................................................................................................3.

2. Dorsal abdominal apodemes 1.5–2 times longer than wide at base, with strongly divergent inner margins separated by wide V-shaped notch (Figs 13–14). Green with lighter and darker spots in fore part of body, darkest males brownish (Figs 1–4)............................................................................................ K. montanus .

- Dorsal abdominal apodemes of approximately equal length and width at base, with parallel or slightly divergent inner margins separated by rather narrow notch (Figs 17–24). Bright green with lighter spots in fore part of body, old dry specimens slightly yellowish (Figs 5–8).......................................................................... K. oshanini .

3. Anal collar appendages wide, with sharply narrowed, extended apices (Fig. 61). Aedeagus with narrowly rounded apex in lateral view and with collar-like expansion at base, distinctly visible in back view (Figs 44–45). On birch. … K. auricillatus .

- Anal collar appendages narrow, falcate (Figs 60, 62–63).Aedeagus with wider apex in lateral view, without collar-like expansion at base (Figs 42–43, 46–49). On poplars or willows..........................................................4.

4. Pygofer appendages with distinct expansions in apical halves (Fig. 56). On poplars.......................... K. populi .

- Pygofer appendages narrow, of uniform width throughout apical halves (Fig. 54, 57)................................5.

5. Aedeagus without lateral processes (Figs 42–43). Live specimens white or greenish white, dry ones yellowish white, sometimes with slight greenish tinge (Fig. 9). On silver poplar................................................. K. niveicolor .

- Aedeagus with lateral processes (Figs 48–49). Brownish green with lighter and darker spots in fore part of body (Fig. 12). On willows..................................................................................... K. virgator