Genus Lithostege Hübner, 1825 Type species: Geometra griseata Denis & Schiffermüller, 1775. Diagnosis. The genus can be diagnosed by the following synapomorphic characters (Rajaei et al., 2011; Rajaei & Stüning, 2013; Rajaei et al., 2019): the forewing is slightly elongated and features two areoles in its venation. The hindwing is oval, narrow and reduced in size, with a shorter anal vein in males and a longer one in females. The foreleg has a significantly thickened femur; the tibia of the foreleg is extremely short and ends distally with a massive, forked projection that includes a longer internal and a shorter external tooth (see Rajaei & Stüning, 2013: fig. 2). Additionally, the foreleg’s epiphysis is small; the midtibia has one pair of spurs and the hind tibia has two pairs of spurs. The male genitalia of most species feature a harpe, a process arising from the basal centre of valva, which is divided into the basal part and a dorsal arm. The female genitalia of most species possess a membranous diverticulum attached to the corpus bursae.

Published as part of Rajaei, Hossein & Kostjuk, Igor, 2024, Contribution to the knowledge of the genus Lithostege Hübner, 1825 (Lepidoptera, Geometridae) with confirming the bona species status of Lithostege amseli Wiltshire, 1967 and descriptions of two new species from Central Asia, pp. 781-795 in Journal of Insect Biodiversity and Systematics 10 (4) on page 783, DOI: 10.61186/jibs.10.4.781, http://zenodo.org/record/17024521