(Figs 3 c, 8g –h)
Prosopis pfankuchi Alfken 1919: 269, Ƥ, 3 (type locality: “N-Schleswig” [Denmark]); Osytshnjuk & Romankova 1995: 486.
Hylaeus nipponicus Bridwell 1919: 151 –152, Ƥ, 3 (holotype—Ƥ, Karuizawa, Japan); Ikudome 1989: 157; Osytshnjuk & Romankova 1995: 486. Synonymized by Proshchalykin et al. 2004: 157.
Hylaeus polevoiae Cockerell 1924 a: 281 –282, Ƥ, 3 (holotype— 3, “Okeanskaja, Siberia” [Vladivostok, Primorskiy Terr., Russia], 5.VIII. 1923, leg. T. Cockerell); Gussakovskij 1932: 64. Synonymized by Warncke 1981: 157.
Prosopis nigrifacies Gussakovskij 1932: 64, Ƥ, 3 (syntype— 4 Ƥ, 1 3, Sedanka, Vladivostok, Primorskiy Terr., Russia, 20.VIII. 1930). Synonymized by Osytshnjuk & Romankova 1995: 486.
Hylaeus japonicus (!): Kuwayama 1967: 208.
Prosopis euzona Warncke 1972: 748 (nom. nov. pro P. nigrifacies Gussakovskij 1932, nec Bramson 1879).
Hylaeus pfankuchi: Proshchalykin 2003 a: 26; 2003 b: 4; 2004: 3; 2005: 30; 2006: 250; 2007 a: 882; Proshchalykin et al. 2004: 157; Ignatenko 2004: 112; Ignatenko & Proshchalykin 2005: 244; Quest 2009: 132; Proshchalykin & Quest 2009: 239.
Material examined: 54 Ƥ, 47 3. Russia. Primorskiy Terr. (Anisimovka, Ryazanovka, Lazovskiy Nature Reserve, Vladivostok, Andreevka, Vityaz, Pos’et, Khorol, Spassk, Novovladimirovka, Benevskoe, Preobrazhenie); Khabarovsk Terr. (Komsomolsk on Amur); Sakhalin (Moneron I., Novoaleksandrovsk, Tunaicha Lake, Bolshoe Vavaiskoe Lake, 12 km W Aniva); Kuril Islands (Shikotan: Delfin Bay, Malokuril'skoye, Tserkovnaya Bay; Kunashir: Dubovoe, Tret'yakovo, Stolbchatyi, Golovnino, Aliger Lake, Goryachee Lake, Alekhino, Yuzhno- Kurilsk, Lagunnoe Lake; Iturup: Odesskii Cape, Kuibyshevskiy Bay).
Distribution in Russia. Primorskiy Terr., Khabarovsk Terr., Sakhalin, Kuril Islands (Iturup, Shikotan, Kunashir).
General distribution. Transpalaearctic-eurosiberian species, east to Russian Far East, China (Jilin), and Japan (Hokkaido, Honshu). In Europe quite rare, only some reliable records from France, Germany, Poland, Czech Republic, Slovakia, Austria, Hungary, Switzerland, Italy, Ukraine. In Sweden up to 55 ° north.