Hylaeus arenarius Morawitz, 1876: 277, ♀, ♂ (lectotype: ♂, designated by Warncke 1981: 150, “Step’ m. S. d. i T. [steppe between Syr-Darya and Tashkent], 18.[May 1871]”, ZMMU).
Material examined. CHINA. 1 ♀, Suleikhe River, neаr Sасhzhоu, Gаshunskоe Gоbi, 7.VIII.1895, V. Rоbоrоvskу, P. Kozlov; 2 ♀, Bugas, near Khami, SE from Tyan'-Shan', 20.VIII.1895; 5 ♀, 30 ♂, idem, 28.VIII.1895; 9 ♂, idem, 30.VIII.1895; 6 ♂, idem, 1.IX.1895; 4 ♂, idem, 2.IX.1895; 3 ♂, idem, 3-5.IX.1895; 2 ♂, idem, 6.IX.1895; 2 ♂, idem, 7.IX.1895; 2 ♂, idem, 8.IX.1895, V. Roborovsky, P. Kozlov.
Distribution. Uzbekistаn, Kаzаkhstаn, * Chinа (Gаnsu, Хinjiаng).