He means Brachymyrmex patagonicus and not Myrmecia
Brachymyrmex patagonicus is a very small species .. the queen should be around 4 or 5mm ... workers 1-2mm ...
But the picture of Brachymyrmex patagonicus has some similarities to Lasius.
In Germany we would refer to Lasius as common black garden ant. But in the states you also have some Lasius specie. Maybe you should search the web for some pictures of Lasius queens ...