Weevils represent one of the most speciose and economically important animal clades, but remain poorly studied across much of the Oriental Region. Here, an integrative revision of the Oriental, flightless genus Voss, 1957 (Curculionidae: Molytinae) based on X-ray microtomography, multi-gene DNA barcoding (CO1, Cytb, 16S), and traditional morphological techniques (light microscopy, dissections) is presented. Twelve new species, namely, Lewis & Kojima, , Kojima & Lewis, , Lewis, , Lewis & Kojima, , Kojima, Lewis & Fujisawa, , Kojima & Lewis, , Lewis & Kojima, , Lewis & Kojima, , Kojima & Lewis, , Lewis & Kojima, , Lewis & Kojima, , and Lewis, Fujisawa & Kojima, are described from Japan, Taiwan, Vietnam, and Malaysia. A neotype is designated for Voss, 1957. The hitherto monotypic genus Morimoto & Miyakawa, 1985, is synonymized under based on new morphological data and (Morimoto & Miyakawa, 1985), is transferred accordingly. X-ray microtomography is successfully used to explore for stable interspecific differences in cuticular, internal and micro morphology. Remarkable species-specific sexual dimorphism in the metatibial uncus is described in seven of the newly described species and the evolution of this character is discussed.