Diagnostic features of adults of Demarchus hsui sp. nov. A elytron, ventral view B metafemora spring C base of elytra, lateral view D hind wing. Abbreviations: cu-cubital vein; dl-dorsal lobe; ea-extended arm; j-jugal vein; m-medial vein; r-radial vein; re-recurved part of epipleuron; rt-sector of radial vein; vl-ventral lobe.