Abstract
The sharpshooter genus Juliaca Melichar, 1926 has 38 known species, being among the most diverse genera of the Cicadellini from the Neotropical Region. Here we describe and illustrate a new species from Ecuador, Juliaca nigrosignata sp. nov., based on males and females from the Province of Sucumbíos (sub-Andean montane forest). The new species can be recognized by the white to brownish-white dorsum with a single, conspicuous black spot on the median portion of the crown; the aedeagus has the apical half directed ventrally and the apex moderately expanded; the female sternite VII has a convex posterior margin, with a distinct median triangular projection. A key to males and females of the now six known Ecuadorian species of Juliaca, based on the color pattern, is provided.
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