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 Megachile nigriventris Schenck, 1870 Megachile nigriventris : Sarychev & Sarycheva, 1989: 161 ( Novosibirsk Prov. ). SPECIMENS EXAMINED. Russia . Novosibirsk Prov . : Gornyi , 11.VI 2015 , 1 ♂ , AB . DISTRIBUTION IN WEST SIBERIA. Tm, No. REMARK. Possibly, Megachile maacki Radoszkowski, 1874 (knowing from Tk, Km) represents an Eastern Palaearctic geographic form of M. nigriventris (Praz, 2017) .