Hylaeus nigrocuneatus Cockerell, 1924: 277, ♀, ♂ (type locality: “Kudia-River, Siberia” [Primorskiy Territory, Russia]); Proshchalykin & Dathe 2012: 24.
Material examined. Kemerovo Province: 3 ♀, 1 ♂, Krapivinskii distr., Azhendarovo, 2–3.VIII. 2009, SNY (KSU); Altaiskiy Territory: 3 ♂, Biisk, 6.VII. 2007, SAB (ZISP); 3 ♂, 8 km S Biisk, Ust'-Katun', 7.VII. 2007, SAB (ZISP); 1 ♀, 40 km SSE Zmeinogorsk, Novoaltaiskoe, 6.VIII. 2007, SAB (ZISP); Altai Republic: 1 ♂, 20 km NW Kosh- Agach, 14.VII. 2007, SAB (ZISP); 1 ♀, Turochakskii distr., Yailo, 5.IX. 1998, E. Korneva (ZISP); Tyva Republic: 1 ♀, 25 km SE Erzin, Tes-Khem River, 5.VII. 2013, MYP, VML (IBSS); Krasnoyarsk Territory: 1 ♀, Krasnoyarsk, Turbaza 3.VII. 2012, MYP, VML (IBSS); 1 ♀, 10 km NE Minusinsk, Malaya Minusa River, 4.VII. 2012, MYP, VML (IBSS).
Distribution in Siberia. * Kemerovo Province, *Altaiskiy Territory, *Altai Republic, *Tyva Republic, *Krasnoyarsk Territory, Irkutsk Province, Yakutia, Zabaikalskiy Territory.
General distribution. Japan (Hokkaido, Honshu, Kyushu), China (Shanghai, Jilin, Shandong), Asian part of Russia.