(Figs 4 e, 10g –h)
Hylaeus pectoralis Förster 1871: 972, Ƥ (type locality: unknown); Proshchalykin 2003 b: 4; 2004: 3; 2005: 30; 2007 a: 882; Proshchalykin et al. 2004: 158; Ignatenko 2004: 112; Ignatenko & Proshchalykin 2005: 244; Konusova et al. 2007: 213. Hylaeus kriechbaumeri Förster 1871: 973, Ƥ, 3 (type locality: München, Germany).
Prosopis palustris Perkins 1900: 49, Ƥ, 3 (type locality: England).
Material examined: 1 Ƥ, 7 3. Russia. Khakasia Republic (Shira Lake); Primorskiy Terr. (Ryazanovka, Spassk); Sakhalin (Tymovsk, Ogonki), Kuril Islands (Kunashir: Alyokhino).
Distribution in Russia. European part (Osytshnjuk et al. 1978), Tomsk Prov., Kemerovo Prov. (Konusova et al. 2007), *Khakasia Republic, Primorskiy Terr., Sakhalin, Kuril Islands (Kunashir).
General distribution. Transpalaearctic, but because of its specific ecological requirements only locally recorded from the Pyrenees to Japan; missing in southern Europe, north to 61 ° in Finland.