1. Bombus (Mendacibombus) convexus Wang

(Fig. 4)

Bombus lugubris Morawitz, 1880:339 (not of Kriechbaumer, 1870:159 = B. maxillosus Klug), holotype worker ZISP examined. China: ‘Gan-su’, probably Qinghai.

Bombus (Mendacibombus) convexus Wang, 1979:190, holotype queen IZB examined. Synonymised with Bombus lugubris Morawitz by Williams (1991). China: Xizang.

Material examined. 2 queens 64 workers 29 males (IAB).

Distribution in Gansu. Common at medium to high altitudes of the Qinghai-Tibetan plateau in the southwest, rare at medium altitudes of the western mountains (Fig. 4); 14 localities between 2196 and 3524 m (IAB).

Distribution in China. Sichuan, Xizang, Gansu (IAB).

Forage plants. ASTERACEAE: Carduus crispus, Ligularia sp., Saussurea purpurascens, Saussurea sp., Senecio jacobaea; LAMIACEAE: Nepeta prattii, Salvia przewalskii, Thymus mongolicus; RANUNCULACEAE: Aconitum gymnandrum, A. leucostomum, Clematis tangutica; SCROPHULARIACEAE: Pedicularis spicata, P. t o r t a, Pedicularis sp.