The tribe Viadaniini n. trib. (Tettigoniidae: Phaneropterinae) is characterized in this paper. It includes twelve genera (two are new): Anaulacomera, Grammadera, Tomeophera, Viadana, Abrodiaeta, Proviadana, Bolivariola, Agennis, Parapyrrhicia, Pleothrix, Montealegrezia n. gen., and Tenellulus n. gen. A diagnosis of the tribe is provided and a key to its genera. Special consideration is given to the genus Anaulacomera Stål, 1873; its problematic history is outlined, and organization into species groups based on males' characters provided, as well as a key to these new groups. The genera Pararota Piza, 1973 n. syn. and Paracora Piza, 1977 n. syn., are synonymized under Anaulacomera. A. darienica Griffini, 1896 n. syn., is synonymized with A. furcata Brunner von Wattenwyl, 1878. A. pizai n. nom. & n. comb. is the new name for Pararota gracilis Piza, 1973 n. syn. The new species described are as follows: A. alexanderi n. sp., A. ferchoi n. sp., A. hernandezi n. sp., A. sarmientoi n. sp., A. ludivinae n. sp., A. parisae n. sp., A. juanchoi n. sp., A. davidi n. sp., A. chirivii n. sp., A. didieri n. sp., A. richteri n. sp., A. valentinae n. sp., A. franciscoi n. sp., M. amacayacu n. sp., T. ariasi n. sp., all from Colombia. The male of V. difformis is here reported and described. With this re-organization the tribe Viadaniini is made up of 153 valid species.