Hylaeus (Hylaeus) oblitus (Warncke, 1972) Hylaeus pusillus Morawitz, 1876: 272, ♂ (holotype: ♂, Kazakhstan, Bairakum, Syr-Dar'ya River, ZISP) (nom. praeocc., nec Schenck, 1853). Hylaeus albitarsis Morawitz, 1887: 226 –227, ♀ (holotype: ♀, “Oasis Nia” [China, Xinjiang], ZISP) (nom. praeocc., nec Schenck, 1853). Synonymized by Dathe & Proshchalykin 2016: 369. Prosopis oblita Warncke, 1972: 748, nom. nov. for Hylaeus pusillus Morawitz, 1876. Prosopis fuliginosus Warncke, 1972: 747, nom. nov. for Hylaeus albitarsis Morawitz, 1887. Hylaeus oblitus: Dathe & Proshchalykin 2016: 370 (Xinjiang); 2017: 37 (Xinjiang). Material examined. CHINA. 1 ♀, 2 ♂, oasis Sachzhou, Gashun' Gobi, 28.VII.1895; 1 ♀, idem, 30.VII.1895; 6 ♀, 4 ♂, idem, 1-3.VIII.1895; 1 ♀, idem, 4.VIII.1895, V. Roborovsky, P. Kozlov; 14 ♀, 13 ♂, Suleikhe River, near Sachzhou, Gashunskoe Gobi, 7.VIII.1895, V. Roborovsky, P. Kozlov; 4 ♀, 4 ♂, Shibendu, Shiguiza, N to Sachzhou, Gashunskoe Gobi, 9-12.VIII.1895, V. Roborovsky, P. Kozlov; 2 ♀, 9 ♂, Shiguza, Bugas River, S to Khami, Gashunskoe Gobi, 19.VIII.1895, V. Roborovsky, P. Kozlov; 7 ♀, 9 ♂, Bugas, Khami, SE from Tyan'-Shan', 20.VIII.1895; 4 ♀, 5 ♂, idem, 21.VIII.1895; 14 ♀, 31 ♂, idem, 28.VIII.1895; 19 ♀, 37 ♂, idem, 30.VIII.1895; 10 ♀, 11 ♂, idem, 1.IX.1895; 3 ♀, 6 ♂, idem, 2.IX.1895; 2 ♀, 4 ♂, idem, 3-5.IX.1895; 13 ♀, 4 ♂, idem, 6.IX.1895; 11 ♀, 5 ♂, idem, 8.IX.1895; 27 ♀, 12 ♂, idem, 10.IX.1895, V. Roborovsky, P. Kozlov; 1 ♂, Etszin-gol, N Alashan', Gоbi, 21.V.1926. Р. Kоzlоv. Distribution. Kаzаkhstаn, Таjikistаn, Mоngоliа, Chinа (* Gаnsu, Хinjiаng).

Published as part of Yu, Maхim & Daтhe, Holger H., 2018, In the footsteps of history: the bees of the genus Hylaeus Fabricius (Hymenoptera, Apoidea: Colletidae) collected by V. I. Roborovsky and P. K. Kozlov in Northwest China (1895 - 1926), pp. 573-588 in Zootaxa 4434 (3) on page 580, DOI: 10.11646/zootaxa.4434.3.11, http://zenodo.org/record/1292263