11. Bombus (Megabombus) sushkini (Skorikov) s. l.

(Fig. 14)

Hortobombus sushkini Skorikov, 1931:235, paralectotype queen (Podbolotskaya, 1988:117) ZISP examined. Kazakhstan. Bombus (Hortobombus) hortorum ssp. morawitzianus Pittioni, 1939:244 (not of Popov, 1931:183 = B. morawitzianus (Popov)), lectotype queen (Tkalců, 1974a:52) BMNH examined. Synomymised with Megabombus sushkini (Skorikov) by Tkalců (1974a). Mongolia.

Material examined. 13 queens 27 workers 3 males (IAB).

Distribution in Gansu. Common at medium to high elevations of the Qinghai-Tibetan plateau in the southwest and northwestern Qilianshan mountains, rare at medium elevations of the western mountains (Fig. 14); 13 localities between 2148 and 3490 m (IAB).

Distribution in China. Neimenggu, Sichuan, Gansu, Qinghai (IAB).

Forage plants. ASTERACEAE: Arctium lappa, Saussurea sp.; FABACEAE: Oxytropis ochrocephala; LAMI- ACEAE: Caryopteris incana, Dracocephalum heterophyllum; RANUNCULACEAE: Aconitum gymnandrum, Clematis tangutica; SCROPHULARIACEAE: Pedicularis kansuensis .