The Oriental stick insect genus Trachythorax Redtenbacher, 1908 is diagnosed, compared to closely related taxa, and reviewed based on examination of type material, collection material and photographic records, including citizen science sourced data. Each species is discussed and two new species are described from Vietnam: T. albomaculatus sp. nov. from Kon Chu Rang National Park in Central Vietnam and T. auranticollis sp. nov. from Dong Nai Biosphere Reserve in Southern Vietnam. Trachythorax yunnanensis Gao & Liang, 2021 stat. nov. is elevated to valid species, from status of subspecies of T. maculicollis (Westwood, 1848). Trachythorax illaesa (Redtenbacher, 1908) stat. rev. comb. nov. is reinstated as a valid species from previous status of junior synonym of T. maculicollis. As a result the genus Trachythorax now contains 15 species.
BRESSEEL J. & CONSTANT J., 2021. - Review of the Oriental stick insect genus Trachythorax Redtenbacher, 1908 with two new species from Vietnam and comments on egg parasitism and morphological counteradaptations (Phasmida, Lonchodidae, Necrosciinae). Belgian Journal of Entomology, 120: 1–56.