A new species of the genus Drosophila, Drosophila sagittifolii sp. nov. is described. Adult specimens of D. sagittifolii were aspirated from the inflorescences of Xanthosoma sagittifolium (L.) Schott (camacho), from which they also emerged, at the Río Guajalito Research Station, Santo Domingo de los Tsáchilas, Ecuador.
