You are correct, Anna. It took me a while to find it. Michael Batley identified two specimens I found in the ACT as 'H. trimerops species group', based on Terry Houston's work. I didn't get a picture, but I will post the microscope images.
There have been very few sightings of this bee and all of these are a long way from the ACT. Makes you realise how little we know about species distribution.