Three new species of the genus Diptilomiopus Nalepa viz., Diptilomiopus osmanthis sp. nov. infesting Osmanthus fragrans Lour. (Oleaceae), Diptilomiopus radermacherae sp. nov. infesting Radermachera sinica (Hance) Hemsl. (Bignoniaceae) and Diptilomiopus styracus sp. nov. infesting Styrax tonkinensis (Pierre) Craib ex Hartw. (Styracaceae) are described and illustrated. All three new species are vagrant on the leaves of their host plant respectively causing no visible damage.