Dathe, 1986 : 296 Dathe, 1986 : 277 Additional records of the genus Hylaeus Fabricius, 1793 (Hymenoptera: Apoidea: Colletidae) from Siberia, with description of a new species Proshchalykin, Maxim Yu. Dathe, Holger H. Zootaxa 2016 4105 4 301 320 6MNH2 Dathe, 1986 Dathe 1986 [151,626,1894,1921] Insecta Colletidae Hylaeus Animalia Hymenoptera 12 313 Arthropoda species stubbei Hylaeus     Hylaeus stubbei  Dathe, 1986: 296, ♂ ( holotype: ♂, Mongolia, Govi-Altai Aimag, Altai, ZNS).    Hylaeus peregrinus  Dathe, 1986: 277, 279, ♀ ( holotype: ♀, Mongolia, Bayan-Khongor Aimag, 30 kmS Bogd, ZNS). Examined. Syn. nov.   Material examined. Altai Republic: 7 ♀, 8 ♂, Kosh-Agach, 14–18.VI.1964, M. Kozlov ( ZISP); 1 ♀, 20 kmNW Kosh-Agach, 14.VII.2007, SAB ( ZISP); 1 ♀, Chemal, 19–21.VII.2007, SAB ( ZISP).   Distribution in Siberia.*Altai Republic.  General distribution. Mongolia, * Russia.   Remarks. The previously undetected association of the sexes was clearly indicated by the newly collected material. The vestiture of the females is not so long or dense as in the males, correspondence in many characters of morphology and sculpture are therefore not easily discernible. The face of the female is characteristically trapezoid in shape ( Fig. 21); the malae in frontal view appear angular; the clypeus protruding, with clearly depressed tentorial pits and longitudinally striped sculpture. Otherwise, the characters described by Dathe (1986: 277, 279)are confirmed. Both names were published at the same time; due to the better definition of the male ( Fig. 20), it is selected as the naming.