1 Polystyrene insulation board. 2Hylaeus ruficeps kalamundae often entered the house and became trapped and attempted to escape by flying and crawling along the glass door, leaving excrement, with many being unable to escape and perishing. 3Hylaeus ruficeps kalamundae were entering and exiting to nest in the polystyrene insulation panels through cracks in the boards; entrances sealed over by the owner of the house resulted in an accumulation of dead Hylaeus ruficeps kalamundae that attempted to enter. 4 Female Hylaeus ruficeps kalamundae on the polystyrene block that had been put out to attempt to encourage them to vacate the insulation boards in the house. 5 A female Gasteruption—a predator-inquiline parasitoid wasp—investigating the polystyrene insulation panel where Hylaeus ruficeps kalamundae were nesting. Photos: Kit Prendergast.