Bombus (Thoracobombus) pascuorum (Scopoli)

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 : 39

26. Bombus (Thoracobombus) pascuorum (Scopoli)

( Figs 54, 55 )

APIS Pa ∫cuorum [ pascuorum ] Scopoli, 1763:306.

Apis ∫enilis [ senilis ] Fabricius, 1775:382.

Apis agrorum Fabricius, 1787:301 (not of Schrank, 1781:397 = B. mesomelas Gerstaecker ).

Material examined. 8 workers, 20 males (IAB).

Distribution in North China. Only in northeastern Neimenggu. Common at low elevations of the Moerdaoga forest park, in the transition zone between the Hulunbeir grasslands and the Great Khingan mountains forests in northeastern Neimenggu. Rare at low elevations of the Nenjiang river valley in Elunchun, northeastern Neimenggu, and at medium elevations of the Huanggangliang forest park of the southernmost of the Great Khingan mountains in Neimenggu. 4 localities ( Fig. 54 ) between 395–1665 m (IAB).

Variation in North China. This species shows strong variation in the colour pattern of the hair across its global distribution. In North China it shows only a small part of this variation (see the key).

Similar species in North China. This species is similar in its brown colour pattern to B. schrencki , B. hedini , B. tricornis and B. atripes (see the key; Figs 55 , 57 , 59, 69, 71).

Distribution in China. Neimenggu, Heilongjiang, Xinjiang (IAB).

Forage plants. ASTERACEAE : Achillea millefolium , Hieracium umbellatum , Saussurea sp., Serratula coronata ; CRASSULACEAE : Orostachys fimbriata , O. malacophylla ; ONAGRACEAE : Chamerion angustifolium ; RANUNCULACEAE : Aconitum kusnezoffii ; SCROPHULARIACEAE : Pseudolysimachion linariifolium .

Figures

FIGURES 54 – 55. 54. Map showing the distribution of B. pascuorum 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. 55. B. pascuorum worker visiting Serratula coronata (Asteraceae) in Neimenggu.

FIGURES 56 – 57. 56. Map showing the distribution of B. schrencki 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. 57. B. schrencki male visting Serratula coronata (Asteraceae) in Neimenggu (PW).