Bombus (Pyrobombus) infrequens (Tkalců), Tkalcu

An, Jiandong, Huang, Jiaxing, Shao, Youquan, Zhang, Shiwen, Wang, Biao, Liu, Xinyu, Wu, Jie & Williams, Paul H., 2014, The bumblebees of North China (Apidae, Bombus Latreille), Zootaxa 3830 (1), pp. 1-89 : 57-58

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 .

Figures

FIGURES 110 – 111. 110. Map showing the distribution of B. infrequens in North China with records as black spots, the province boundaries in dark grey, and all sites with records of all bumblebee species in light grey. 111. B. infrequens worker visiting Buddleja sp. (Buddlejaceae) in Gansu.

FIGURES 62 – 63. 62. Map showing the distribution of B. remotus in North China with records as black spots, the province boundaries in dark grey, and all sites with records of all bumblebee species in light grey. 63. B. remotus worker visiting Cirsium leo (Asteraceae) in Gansu.

FIGURES 108 – 109. 108. Map showing the distribution of B. picipes in North China with records as black spots, the province boundaries in dark grey, and all sites with records of all bumblebee species in light grey. 109. B. picipes queen visiting Cirsium monocephalum (Asteraceae) in Gansu.

FIGURES 116 – 117. 116. Map showing the distribution of B. wangae in North China with records as black spots, the province boundaries in dark grey, and all sites with records of all bumblebee species in light grey. 117. B. wangae worker visiting Chamerion angustifolium (Onagraceae) in Gansu.