Reference

Marc Newman, Bernhard Jacobi (2011): Operculum-lifting behaviour in the Eucalypt-visiting hylaeine bees Meroglossa impressifrons penetrata (Smith, 1879) and Hylaeus (Hylaeorhiza) nubilosus (Smith 1853). – Bembix - Zeitschrift für Hymenopterologie – 32: 5 - 12.