ABSTRACT Lethaeini is a diverse tribe within Rhyparochromidae, with Lethaeus Dallas being the most speciose genus. This study is focused on the poorly documented Lethaeus lepidus White, the only species in the genus recorded from the Neotropics. Through a reexamination, this species is considered a new synonym of Petissius spinipes Stål. The examined material is sourced from recent field expeditions in natural areas in Brazil, as well as from entomological collections. In addition, the types of the described species were studied from high-definition photographs. The distribution of P. spinipes is updated, indicating that the species is widely distributed in the Neotropics, and filling a large geographic gap with many new locality records. Distribution map including the new records and high-definition illustrations of the species and diagnostic characters are provided. As a result of the findings presented, there are currently no documented representatives of the genus Lethaeus in the New World. With the previouly significant geographical gap between Argentina and Guyana, the 12 new Brazilian state records substantially amplify our undertanding into the species’ range. This emphasizes the indispensable role of entomological collections and the need for dedicaded sampling expeditions to enhance our undertanding of overlooked taxa, as is often the case for Rhyparochromidae.
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