The Oriental and Neotropical delphacid genus Malaxa is reviewed and currently includes 11 species. Malaxa fusca Yang and Yang (1986) is removed from synonymy with M. semifusca Yang & Yang 1986, and is considered valid. Malaxa bispinata Muir, 1926, is re-described and re-illustrated as a new record in China. The fifth instar of M. delicata Ding & Yang 1986, is described and illustrated for the first time. A key to the species of this genus in China is provided.