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 ) tsingtauensis ( Strand, 1915 ) Prosopis tsingtauensis Strand, 1915 : 62 –63, ♀ (holotype: ♀, China, Tsingtau [Dsingdao, Shandong Province], SDEI); Ikudome 2013 : 4 (Shandong, Henan); Dathe 2015 : 232 (Sichuan, Henan, Beijing). Hylaeus pallescens Cockerell, 1924 : 279 –280, ( type locality: Vladivostok , Primorskiy Terr., Russia , USNM ). Hylaeus stentoriscapus Dathe, 1986a : 271 –273, , ( type locality: Uvs Aimag, Mongolia , ZNSH ). Hylaeus montivagus Dathe, 1986a : 273 , ( holotype : , “ Uvs , Charchiraa uul, Ulaangom 30 km SW, Umgebung Ferienheim “Kurort” Steppe [ Uvs Aimag, Mongolia ], 1340 m , VI.1978 , leg. M. Dorn”, ZNSH, examined).— Syn. nov. Material examined. CHINA . 2 ♀ , Dаnkhe River , S Sасhzhоu, Gаshun' Gоbi , 24-27.VII.1895 , V. Rоbоrоvskу , Р. Kozlov ; 1 ♀ , Sinin-khe River valley , E Nan'shan' , 26.VII.1908 , P. Kozlov. Distribution. Russiа (Asiаn pаrt), Mоngоliа , Chinа ( Beijing , * Gаnsu , Henаn , * Qinghаi , Shаndоng , Siсhuаn).