Hylaeus (Nesoprosopis) pectoralis Förster 1871 (Figs 4 e, 10g –h) Hylaeus pectoralis Förster 1871: 972, Ƥ (type locality: unknown); Proshchalykin 2003b: 4; 2004: 3; 2005: 30; 2007a: 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.

Published as part of Yu, Maxim & Dathe, Holger H., 2012, The bees of the genus Hylaeus Fabricius 1793 of the Asian part of Russia, with a key to species (Hymenoptera: Apoidea: Colletidae), pp. 1-36 in Zootaxa 3401 on page 23, DOI: 10.5281/zenodo.208438