Figs 13–24 in Three new Lethrus species close to L. raymondi (Coleoptera: Geotrupidae) from the Balkan Peninsula

Figs 13–24. Head, lateral aspect. Maximally developed males: 13 – Lethrus (Lethrus) halkidikensis sp. nov. (holotype); 16 – L. (L.) perun sp. nov. (holotype); 19 – L. (L.) raymondi Reitter, 1890 (Greece: Néa Filadélfia – OHCB); 22 – L. (L.) strymonensis sp. nov. (holotype). Medium developed males: 14 – Lethrus (L.) halkidikensis sp. nov. (paratype, Greece: Tagarádes – OHCB); 17 – L. (L.) perun sp. nov. (paratype, Bulgaria: Khotovo – OHCB); 20 – L. (L.) raymondi (Greece: Néa Filadélfia – OHCB); 23 – L. (L.) strymonensis sp. nov. (paratype, Greece: Séres – OHCB). Underdeveloped males: 15 – Lethrus (L.) halkidikensis sp. nov. (paratype, Greece: Tagarádes – OHCB); 18 – L. (L.) perun sp. nov. (paratype, Bulgaria: Khotovo – OHCB); 21 – L. (L.) raymondi (Greece: Néa Filadélfia – OHCB); 24 – L. (L.) strymonensis sp. nov. (paratype, Greece: Séres – OHCB). Lettering: a – lateral longitudinal keel on base of ventral mandibular process, b – subapical tooth of ventral mandibular process, c – apical tooth of ventral mandibular process. Schematically, not to scale.