Reference

Bernhard Jacobi, Marc Newman (2012): Pollen collecting behaviour of the hylaeine bees Hylaeus (Hylaeteron) douglasi Michener, 1965 and H. (Hylaeteron) riekianus Houston, 1981 (Colletidae, Hylaeinae) on Grevillea-species (Proteaceae) in Western Australia. – Bembix - Zeitschrift für Hymenopterologie – 33: 8 - 18.