The protandrenine bee genus Liphanthus Reed (Panurginae: Protandrenini) is currently known from Chile and Argentina. Liphanthus (Melaliphanthus) cuscoensis Gonzalez, Rasmussen, & Engel, new species, is described and figured from a male collected in Cusco, Peru, at 4167 meters of elevation. This finding represents the northernmost record for the genus and the fourth protandrenine species described
... [Show full abstract] from Peru. An updated key to the species of the subgenus Melaliphanthus Ruz & Toro is provided.