At the Seedy Saturday on the weekend where I was selling mason bees I met Dr. Elaine C. Humphrey, Fellow of Microscopy Society of America. A Past President Microscopical Society of Canada she works at the Advanced Microscopy Facility.
Bob Wright Science Centre A015, University of Victoria.
Dr Humphrey has provided the following images she has taken using Scanning Electron Micrography of the Varroa mites that are parasitic in honey bee ( Varroa mites (Varroa destructor and V. jacobsoni) )colonies. These mites are similar to the mites that infect Mason bee tubes if you are not conscientious about cleaning out you tubes in the fall. See this reference on mason bee mites:
