In trying to identify mole cricket species using "A Guide To Crickets of Australia" by David Rentz and You Ning Su, I believe this to be Gryllotalpa nitidula. The only group of mole crickets with a smooth and shiny pronotum is the Nitidula group composed of 2 species (Rentz p 354), only one of which occurs in the ACT (the other only occurs in Queenland). Therefore this must be Gryllotalpa nitidula.