Abstract Carinodula chiapanensis Bares and Ivie, new species, is described from the Sierra Madre de Chiapas, Mexico. It is diagnosed and illustrated, distinguished from its only congener, Carinodula campbelli Gordon, Pakaluk, and Ślipinski, by details of the prothorax, first ventrite, and genitalia. The definition of the genus is expanded to accommodate the new species. The first example of sexual dimorphism in the tribe Carinodulini is described — the presence of a patch of dense setae on ventrite I of the male.