Supplemental data and addenda are provided to complement and correct the work of Polhemus (2011) dealing with Hawaiian Orthotylus species. The following new species are described, accompanied by illustrations of key morphological characters, distribution maps, and color dorsal habitus photographs: O. erythrinae from Oahu, which feeds on Erythrina sandwicensis, and O. broussaisiae from Kauai, which feeds on Broussaisia arguta. Additional distribution records are provided for O. dubautiae D. Polhemus, O. hedyotivorus D. Polhemus, and O. kopikoides D. Polhemus. The name Orthotylus perrottetioides is proposed as a replacement name for Orthotylus perrottetiopsis Polhemus 2011, which due to a lapsus is a primary homonym of Orthotylus perrottetiopsis Polhemus 2003, and addenda to Polhemus (2011) related to this change are detailed. A revised key to Hawaiian species of Orthotylus occurring on Perrottetia is provided, accompanied by color dorsal habitus photographs of the males and females of the four known Perrottetia-feeding Hawaiian species. A revised checklist and updated of Hawaiian Orthotylus species, host plants, and islands of occurrence is also provided.
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