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Twelve new species of the genus Amphimenes Bates, 1873 are described from Vietnam: Amphimenes maculatus sp. n., Amphimenes bidoupensis sp. n., Amphimenes gracilis sp. n., Amphimenes montanus sp. n., Amphimenes giganteus sp. n., Amphimenes medius sp. n., Amphimenes minutus sp. n., Amphimenes rufipes sp. n., Amphimenes reflexicollis sp. n., Amphimenes planicollis sp. n., Amphimenes nitidus sp. n., and Amphimenes kabakovi sp. n.. Amphimenes rugulipennis Bates, 1892, comb. n., is transferred from the genus Brachichila Chaudoir, 1869 and is redescribed from fresh material. A key to all congeners is provided, these being arranged into five new species-groups. Adults of the rugulipennis- and piceolus-groups show subcortical habits, while those of the medius-, rufipes- and planicollis- groupsare herpetobiotic, resulting in such morphological adaptations as partly reduced eyes, missing wings and adnate elytra.

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PL, length of pronotum along median line; PW, maximum width of pronotum; PWa, width of pronotum between apical angles; PWb, width of pronotum between basal angles. Measurements were taken using an eyepiece micrometer, to two decimal places. The number of specimens measured (n) is only given for the first ratio in the description. Data on labels of type specimens are in quotes. Provinces of Vietnam and Indonesia are given in italics.

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