The genus Procidelphax, gen. nov., is described to accommodate two unusual new Tropidocephalini, P. depressa, n. sp. and P. dejecta, n. sp., from Peru and Bolivia, respectively. Procidelphax, gen. nov., is easily distinguished from all other New World Tropidocephalini by being strongly dorsoventrally flattened, and having the median carina of the frons broadly forked ventrad. The New World Tropidocephalini is briefly reviewed and a provisional key to the five genera provided.
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