Acanthotomicus diaboliculus Cognato and Smith, new species and Acanthotomicus enzoi Cognato and Smith, new species are described from Yunnan, China and central Thailand. The pattern of elytral declivital spines distinguishes these species from each other and from Acanthotomicus spinosus (Blandford). These new species increase the described diversity to six and five species for China and Thailand, respectively. It is likely that the species diversity is higher for this region.