Osmia caerulescens
Blue mason bee
Megachilidae
Vancouver Island Lower Mainland
Observation notes
Sandhouse 1925: (R.C.Treherne), 1920, Victoria. Buckell 1950: (R.C.Treherne), 1917, 1920,Royal Oak, Victoria. Tommasi et al. 2004: Greater Vancouver Area. Ratti et al. 2008: Fraser Valley. Spencer Entomological Collection, UBC: (C. Terpama), 2015, Delta. M. Clausen, Masters thesis: 2017, Delta. Guzman et al., 2023: (Neame), 2007; (Wray), 2012; (Gillespie), 2014, 2015, Vancouver Island. (Button), 2011; (Gehrels), 2013; (Elle), 2016, Lower Mainland. iNaturalist: Vancouver Island, Delta, from 2017.