Identification key to males of Lethrus (Scelolethrus) sulcatus species group with conspicuously conical pleurostomal processes 1. Ventral mandibular process long (cf. Gusakov & Klimenko 2011: 6, fig. 3 and 7, fig. 5). Iran: Golestan .................................................................................. L. (S.) percutens Gusakov & Klimenko, 2011 – Ventral mandibular process short or almost absent (Figs. 5, 8–13)............................................... 2 2. Profemora with distinctly prominent tooth anteroventrally (cf. Král & Olexa 1996: 63. fig. 37), in less developed males only with slight tubercle. Pronotal punctation double, consisting from coarse and very fine punctures. Inner edge of parameres broadly angulate subapically (Fig. 15). Iran: Khorasan Shamali Prov........................ L. (S.) mithras Reitter, 1904 – Profemora with transversal edge anteroventrally (cf. Král & Olexa 1996: 63, fig. 35). Pronotal punctation simple and fine. Inner edge of parameres angulate or rounded subapically (Figs. 14, 16)................................................ 3 3. Ventral mandibular processes weak and angulate in lateral aspect, invisible in dorsal aspect (Figs. 10, 13). Inner edge of parameres broadly rounded subapically (Fig. 16). Turkmenistan: north-western part of Kopet Dagh Mts., approximately between the regions of Kara Kala [= Garrygala or Maktymguly] and Bakharden [= Baharly]........ L. (S.) tekkensis Král & Olexa, 1996 – Ventral mandibular processes distinct, directed obliquely anteroventrally, pointed apically in lateral aspect, clearly visible in dorsal aspect (Figs. 4, 8). Inner edge of parameres angulate subapically (Figs. 6, 7, 14). Iran, Golestan: region between Atrek and Gorgan river................................................. L. (S.) golestanicus Král & Hillert, new species

Published as part of Král, David & Hillert, Oliver, 2021, Lethrus (Scelolethrus) golestanicus (Coleoptera: Geotrupidae: Lethrinae), a new species from Iran, pp. 585-590 in Zootaxa 5052 (4) on page 590, DOI: 10.11646/zootaxa.5052.4.8, http://zenodo.org/record/5577369