1. Bombus (Mendacibombus) convexus Wang

(Figs 4, 5)

Bombus lugubris Morawitz, 1880:339 (not of Kriechbaumer, 1870:159 = B. barbutellus (Kirby)) . Bombus (Mendacibombus) convexus Wang, 1979:190 .

Material examined. 2 queens, 73 workers, 31 males (IAB).

Distribution in North China. Only on the edge of the east Qinghai-Tibetan plateau. Common at medium to high elevations of the Zhagana nature reserve, the Liancheng nature reserve, and the Lianhuashan nature reserve in Gansu. 18 localities (Fig. 4) between 2196–3524 m (IAB).

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

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