太白山南坡吸血虻类的垂直分布及区系分析

太白山南坡的吸血虻类有2亚科，5属、46种。分布于8个垂直带，以1000-1500m的松栎林带最多，600-1000m的常绿阔叶林和落叶林混交林带次之， 1500-2000m的杂木林带第三，600m以下，2000m以上较少。 其区系为古北界与东洋界过渡地带，以古北界为主，600-2000m为过渡中心，1000-1500m为两界分界地带。

FAUNA OF TABANIDAE ON THE SOUTHERN SLOPE OF TAIBAI MTS. AS INFLUENCED BY ELEVATION

For 6-8 months each year from 1983 to 1988, we made investigations on the fauna of Ta-banidae and its vertical distribution on the southern slope of Taibai Mts. A total of 46 species in 5 genera were obtained, which included 7 species of Chrysops belonging to the subfamily Chrysopinae, 3 species of Atylotus, 6 species of Hybomitra, 5 species of Haematopota and 25 species of Tabanus in the subfamily Tabaninae.According to the the vegetation, climate and elevation above sea level, the southern slope of Taibai Mts was divided into 8 vertical zones. Among these zones, the number of species of the tabanids was highest in the Pinus-Qurcus forest (1000-1500 m), i.e. 42 species accounting to 91.3% of the total species discovered, the second came the evergreen broad-leaf and deciduous forest (600-1000 m), in which 36 species were found according to 78.3% of the total, and the third was in the mixed forest (1500-2000 m) where 24 species according to 52.2% were found. In places below 600 m or above 2000 m less species had been discovered.The fauna of Tabanidae investigated could be considered as a transitional zone for Pa-laeartic to Oriental, the Palaeartic fauna is prominant, the zone in 600-2000 m to be the tran-sitional center, while that of 1000-1500 m to be the division line between the two regions in Qinling Mountains.