Superfamily Scarabaeoidea Latreille, 1802
   Family Scarabaeidae Latreille, 1802 - scarab beetles, dung beetles, and june "bugs"
     Subfamily Melolonthinae Leach, in Samouelle, 1819
       Tribe Xylonychini Britton, 1957 see Tribe Xylonichini Britton, 1957, nom. emend.
         1 Genus Xylonychus err. see Genus Xylonichus Boisduval, 1835