Abstract: Most flowers of Clematis heracleifolia DC. droop greatly, which need pollinating insects for pollination. However, there has been no report on the flower-visiting insects of C. heracleifolia so far. During two years’ field investigation, we observed twenty-seven insect species visiting the flowers of C. heracleifolia. Seven of them are nectar robbers, of which one is involved in the primary and secondary nectar robbing, two are the primary robbers, and the other four are the secondary robbers; Xylocopa appendiculata Smith is the main nectar robber, and its activities affect the foraging behaviors of other flower-visiting insects and the pollination of C. heracleifolia. Among other twenty flower-visiting insects, Lobocla bifasciata (Bremer et Grey), Gonodontis aurata Prout, Bombus sp. and Systropus sp. are the dominant species; Oxycetonia jucunda Faldermann and Ducetia japonica (Thunberg) rarely visit flowers, but feed on the flowers only. Through investigation of the flowervisiting insects and study on the behavior of the nectar robbers, reference data can be acquired for the pollination and protection of C. heracleifolia.

Key words: Clematis heracleifolia, pollination, pollinating insects, flower-visiting frequency, nectar-robbing