Tropical forest canopies are home to an extremely high diversity of arthropods, but the abundance and community structures of species inhabiting tropical forest canopies remain unclear. We characterised assemblages of canopy-foraging hemipteran species, which are one of the most dominant groups in tropical forest canopies. We used a canopy crane to sample hemipteran assemblages in a Bornean rain forest from an average of 165 canopy trees per sample, over six sampling periods. Our sampling periods occurred during and after a community-wide synchronous flowering, called a general flowering (GF) event, which occur at irregular, supra-annual intervals in the region. During each sampling period, we assessed hemipteran abundance, species richness and species compositions. We also analysed correlations between GF events and tree families for the abundance and occurrence of the abundant hemipteran species. The results showed that the GF event caused dynamic changes in the species diversity and species compositions of adult hemipterans. We hypothesise that the availability of flowers, buds and seeds during a GF event influences assemblages of phytophagous hemipteran adults. In addition, the abundances of some opportunistic predaceous species were strongly correlated with the GF event, possibly due to increases in the abundance of prey that rely on floral resources, as well as plant materials. We found that specialisation of phytophagous species to the tree family level was uncommon in our study, with most species having more general occurrences and distributions. Our study highlights the usefulness of canopy cranes to characterise hemipteran assemblages in tropical forest canopies.