FIGURES 49–54 in Sinolethrus, a new subgenus of the genus Lethrus Scopoli, 1777 from China (Coleoptera: Geotrupidae: Lethrinae) and new synonymy of the subgenus Paralethrus Nikolajev, 2003

FIGURES 49–54. Head of Lethrus species with mandibular appendix, keels and hornlike apophyses of mandibles (males), schematically. 49–51 L. (Mesolethrus) microbuccis Ballion, 1871 (49 frontal view, 50 lateral view, 51 dorsal view); 52–54 L. (Neolethrus) arcanus Medvedev, 1971 (52 frontal view, 53 lateral view, 54 dorsal view).