A review of Himalcercyon stat. nov., with description of a new species from the Chinese Himalaya and an updated key to Asian genera of Megasternini (Coleoptera, Hydrophilidae)

Ventral view of thorax and additional diagnostic characters of eastern Palaearctic and Oriental genera of the Megasternini. A–C. Ventral view: A. Pseudocercyon andrewesi. B. Cercyon sp. C. Gillisius madurensis, holotype. D–H. Other characters: D. Cryptopleurum coomani, mentum. E. Emmidolium excavatum, pronotum. F. Bolbonotum sp., base of elytra. G. Kahanga inconspicua, holotype, base of elytra. H. Australocyon sp. (A. pilocnemoides group), hind femur.