Wood-boring Masked Bee

Size 9mm. This species was found around the upturned root of a dry tree log. There were spiderwebs nearby covered in sawdust. I hardly noticed the animals. They navigate like flies in a smooth way, very fast and silent. I found a nest where they came back. It seemed very busy with several individuals around. When I saw something move inside the trunk, I held the camera onto it. I didn't get many good shots. But on one there are even two individuals visible. I have no idea how they managed to get past me without me noticing at all, not seeing nor hearing them. This blurry photo shows that at least one individual had yellow markings at the front of the head, too. From my research on the web, I decided that it is impossible to make an identification in this group. It is certainly Hylaeinae. I found several genera and species that seem to show yellow shoulder patches and a large, double and yellow mark. I find the legs to be quite confusing. I also could not find a representation with the dull-yellow neck that reminds of a sugarbag bee. The wings are remarkably short, and show strong venation. My specimen looks similar to http://www.brisbaneinsects.com/brisbane_bees/MaskedBee.htm (unfortunately we see typo in the Latin name), and a representation of the same species in Bowerbird. However, my specimens were definitely half the indicated size. Also, Palaeorhiza parallela (corrected spelling) and the genus look totally different, suggesting that some experts misidentified this one. So, we have a native bee instead of a wasp that I was hoping to document. I call it Wood-boring Masked Bee.