Thoracocyphus Emden is a genus of broad-nosed weevils (Entiminae: Naupactini) with only two species: T. denticollis Emden and T. hatschbachi Bondar. Both taxa are endemic to Brazil and range in the states of Goiás, Minas Gerais and Paraná. Based on morphological characters of the antennae, eyes, mouth-parts, corbel plates and spermatheca, Thoracocyphus is closely related to Briarius [Fischer de Waldheim] (syn. of Lamprocyphus Marshall). The strong denticles located on the inner face of the three pairs of tibiae, and the presence of tubercles on the sides of the pronotum and humeri indicates that Thoracocyphus is more closely related to Teratopactus Heller. This contribution includes redescriptions of the genus and its species, a dichotomous key, habitus photographs and illustrations of the diagnostic characters of the external morphology, mouth-parts and genitalia.