An ongoing survey to document planthopper diversity on palms (Arecaceae) is being conducted in Costa Rica. During these efforts a new species of derbid planthopper belonging to the genus Agoo was found on Astrocaryum alatum Loomis in the Heredia province at La Selva Biological Station and is described here as Agoo luzdenia Bahder Bartlett sp. n., bringing the genus to four described taxa-A. dahliana, A. luzdenia Bahder Bartlett sp. n., A rubrimarginata, and A. xavieri. Sequence data for the cytochrome c oxidase subunit I (COI) and 18S genes was generated for the novel taxon and strongly supports its placement in the genus Agoo.
Keywords: Hemiptera, Cenchreini, new species, Derbidae.