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) Author Yu, Maхim Author Daтhe, Holger H. text Zootaxa 2018 2018-06-18 4434 3 573 588 journal article 29867 10.11646/zootaxa.4434.3.11 9821a4a5-b192-48ac-a98a-86241400cb02 1175-5326 1292263 096CAD80-4176-4C2E-AEEE-7D4B5B991479 Hylaeus ( Hylaeus ) medialis Morawitz, 1890 Hylaeus medialis Morawitz, 1890 : 384 –385, ♀ (lectotype: ♀, designated by Dathe 1986b : 31 , “Kansu, Atu-Lunva [China]”, ZISP); Chen & Xu 2009 : 49 (Sichuan); Dathe & Proshchalykin, 2017 : 26 (Gansu, Sichuan, Yunnan). Hylaeus bimaculatus Chen & Xu, 2013 : 341 –344, ♂, ♀ (holotype: ♂, the Napa Lake La Prairie protection zone, Zhongdian County, Yunnan Province, China, 3280 m , 8.VI.2012 , leg. Huan Chen, CAUB). Synonymized by Dathe & Proshchalykin, 2017 : 26 . Material examined. CHINA . 1 ♂ , Khаbirgа, Bаgаtsаdаmin Lаke , E Тsаidаm, 3-11.VI.1895 , V. Rоbоrоvskу , Р. Kоzlоv. Distribution. Chinа ( Gаnsu , * Qinghаi , Siсhuаn, Yunnаn ).