54. Bombus (Pyrobombus) infrequens (Tkalců)

(Figs 110, 111)

Pyrobombus (Pyrobombus) infrequens Tkalců, 1989:56 .

Material examined. 20 males (IAB).

Distribution in North China. Only in the Qin-Ba mountains in southeastern Gansu. Common at medium elevations of the Baishuijiang nature reserve in southernmost Gansu. Rare at medium elevations of the Maijishan forest park and the Guanshan forest park of the west Qinling mountains in eastern Gansu. 3 localities (Fig. 110) between 1770–2225 m (IAB).

Similar species in North China. This species is similar in its yellow-grey colour pattern to some B. remotus, B. picipes and B. wangae (see the key; Figs 63, 109, 111, 117).

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

Forage plants. ASTERACEAE: Cirsium leo; BUDDLEJACEAE: Buddleja sp.; FABACEAE: Melilotus officinalis .