This study describes the morphology and distribution of antennal sensilla of adult Dyscinetus rugifrons (Burmeister, 1847). Insects were collected using a light trap installed in a pasture area in São José do Jacuri, MG, from December 2018 to February 2019. At the entomology laboratory of the State University of Mato Grosso do Sul, in Cassilândia, MS, the insects were separated into males and females, observing the dilated pre-tarsomeres in males. The proximal, median, and distal lamellae were separated from the antennae and then stored in 70% alcohol for preservation. Scanning electron microscopy (SEM) images were obtained at UNESP in Ilha Solteira, SP. In the antennae of adult D. rugifrons, tricodide, chaetic, coeloconic type I and type II, placodide type I, type II and type III, auricic, and ampulaceous sensilla were identified. In the antennae of females, 5,461 sensilla were counted, of which 5,306 are placodide (97.16%), 154 are coeloconic (2.82%), and one is classified as an auricic sensilla (0.02%). In males, 5,161 sensilla were counted, with 5,032 placodide sensilla (97.50%) and 129 coeloconic sensilla (2.5%). Thus, adult D. rugifrons exhibit sexual dimorphism in antennal sensilla.