Megachilid bees (Hymenoptera: Megachilidae) of the forest-steppe and steppe zones of the West Siberian Plain to the eastward of Irtysh River Author Byvaltsev, A. M. Author Belova, K. A. Author Danilov, Yu. N. Author Molodtsov, V. V. Author Proshchalykin, M. Yu. text Far Eastern Entomologist 2018 2018-08-06 364 10 28 http://dx.doi.org/10.25221/fee.364.3 journal article 10.25221/fee.364.3 2713-2196 7168544 4AB4FCC6-527A-46D7-8A1B-7EA8B5B100A3 Lithurgus chrysurus Fonscolombe, 1834 Lithurgus chrysurus : Lavroff, 1927: 95 ( Omsk Prov. ). REMARK. Lavroff (1927) listed this species for the Omsk environs without data on specimens but noted that observations were made mainly in August. It is possible that most of his Lithurgus specimens were males with faded pubescence, which can cause them to be misidentified as L. chrysurus . Males of these species are easily distinguished by the shape of sternum 6 – widely rounded apically in L. cornutus and narrowed apically, nearly triangular in L. chrysurus . Although the observation of Lavroff may be based on misidentification, the occurrence of L. chrysurus in the West Siberian steppes is possible because it was listed for the Central Asian part of the former USSR (Banaszak & Romasenko, 2001), although verification of its presence in West Siberia is needed.