A taxonomic study and faunistic distribution of Bombus in the northern slopes of Qilian Mountains

The species of Bombus were studied by a field investigation in the northern slopes of Qilian Mountains during 2004-2007，accordig to the collected samples and specimens in the Institute of Zoology, CAS. Fourteen species of Bombus in the northern slopes of Qilian Mountains were identified. In addition, the fauna of Bombus in studied region was preliminary analysed. The results showed that Bombus in the northern slopes of Qilian Mountains mainly composited of species of the Palaearctic in terms of the world fauna, followed by Oriental and Palaearctic species. Among 7 distribution types of Chinese animals geographical division. Qinghai-Tibet and Mongo-Sinkiang species accounted for the first in the studied region, and for singlezone kind, Mongo-Sinkiang and Qinghai-Tibet especially Mongo-Sinkiang existed only. For crossspecies, crossMongo-Sinkiang types accounted for 88.89% of the total species, followed by crossQinghai-Tibet, southwestern China, North China, while across central and southern China were limited.