A new species of the Neotropical genus Smilidarnis Andrade (Hemiptera, Membracidae), with a new country record for the genus

<i>Smilidarnis</i> is <b>fixed as the correct original spelling</b>. <i>Smilidarnissimilifasciatus</i>, <b>sp. nov.</b>, from Bolivia and French Guiana, closely resembles <i>S.fasciatus</i> Andrade in being brightly colored but differs in the metathoracic tibial chaetotaxy, the male pygofer, first anal segment, aedeagus, and color pattern. In this new species, which is larger than <i>S.fasciatus</i>, females are larger than males. Photographs of the male and female adults and genitalia of the new species are provided. Bolivia is a new country record for the genus. A key to all species is provided.