On the Leaf Beetle Genus Longitarsus Berthold, 1827 from the Caucasus, with the Description of a New Species (Coleoptera, Chrysomelidae, Galerucinae, Alticini)

A new species of leaf beetle, Longitarsus kovali Romantsov sp. n., is described from Abkhazia. A new identification key is proposed to distinguish the new and closely related species L. fulgens (Foudras, 1860), L. languidus Kutschera, 1863, L. medvedevi Shapiro, 1956, and L. tristis Weise, 1888. Syntypes of L. ratshensis Khnzorian, 1962 are revised, the lectotype is designated, and photographs of the adult habitus in dorsal view and the genitals for both sexes of this species are provided. Differences between this species and the closely related L. ledouxi Doguet, 1979 are presented. Longitarsus medvedevi is recorded from Kazakhstan for the first time.