Mastostethus is a genus of beetles in the family Megalopodidae, containing the following species: \n* Mastostethus aulicus Lacordaire, 1845 \n* Mastostethus brasiliensis Papp, 1949 \n* Mastostethus costaricensis Guerin, 1948 \n* Mastostethus dentatus Klug, 1824 \n* Mastostethus femoralis Pic, 1950 \n* Mastostethus multinotatus Pic, 1917 \n* Mastostethus pallidofasciatus Pic, 1917 \n* Mastostethus rubricollis Chevrolat, 1834 \n* Mastostethus stali Baly, 1861 \n* Mastostethus transversalis Lacordaire, 1845 \n* Mastostethus variegatus Klug, 1824 \n* Mastostethus vittatus Klug, 1824