18. Bombus (Thoracobombus) humilis Illiger

(Fig. 21)

Apis fulve ʃ cens [ fulvescens] Schrank, 1802:367. Nomen oblitum (Williams et al., 2009). Germany.

Bombus humilis Illiger, 1806:171, holotype worker MNHU examined. Synonymised provisionally with Apis fulvescens Schrank by Warncke (1986). Nomen protectum (Williams et al., 2009). Germany.

Bombus (Agrobombus) helferanus var. subbaicalensis Vogt, 1911:42, 54, 10 queen and 1 worker syntypes ZMA examined. Regarded as conspecific with Megabombus humilis (Illiger) by Tkalců (1974a). Russia:?Primorskiy Kray.

Material examined. 55 workers 2 males (IAB).

Distribution in Gansu. Common at low to medium elevations of the southeastern mountains and eastern loess plateau, rare at medium elevations of the Qinghai-Tibetan plateau in the southwest (Fig. 21); 20 localities between 1113 and 3130 m (IAB).

Distribution in China. Beijing, Hebei, Shanxi, Neimenggu, Sichuan, Shaanxi, Gansu, Ningxia (IAB).

Forage plants. ASTERACEAE: Cirsium leo, Cirsium monocephalum; FABACEAE: Astragalus bhotanensis; LAMIACEAE: Caryopteris tangutica, Dracocephalum heterophyllum, Mentha haplocalyx; RANUNCULACEAE: Clematis tangutica .