Bumblebees are important pollinators of mountain flowers，and as such，play a major role in maintaining
biodiversity and ecosystem function． The Maijishan Scenic Area is located in southeastern Gansu in the Western Qinling
Mountains; a transition zone between the northern temperate loess plateau，the southern subtropical mountains and the
western high elevation，cold Qinghai-Tibetan plateau． To assess bumblebee diversity in the Maijishan Scenic Area we
conducted a field survey between 2007 and 2010． During this survey，1 765 specimens ( 20 species and 7 Bombus
subgenera)，were collected from 12 sample sites in the Maijishan Scenic Area． Of these 12 sites，the highest species
richness was found in Shimen and Jingtusi． Bombus pyrosoma，B． ignitus，B． remotus，B． hypocrita s． l． and B． picipes
were the 5 most abundant species． The main regional component of the bumblebee fauna of the Maijishan Scenic Area was
Oriental + Palaearctic (55% ) with the proportion of Oriental species higher than that of Palaearctic species． A similar
pattern was found in the Baishuijiang nature reserve in the southern mountains，the Zhagana natural reserve in the western
Qinghai-Tibetan plateau，but not at the Kongdongshan Scenic Area on the northern loess plateau．