FIGURES 18–23 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 18–23. Head of Lethrus species with mandibular appendix, keels and hornlike apophyses of mandibles (males), schematically. 18–20 L. (Furcilethrus) banghaasi Reitter, 1893 (18 frontal view, 19 lateral view, 20 dorsal view); 21–23 L. (Furcilethrus) tenuidens tenuidens Reitter, 1890 (21 frontal view, 22 lateral view, 23 dorsal view).