Byrsax sp: Tenebrionidae
Byrsax sp: Tenebrionidae, integument up close
Geoff Monteith notes that this beetle is one of three species known from Australia. Males have the horns. The beetles live in large bracket fungi. He says they have one of the most powerful smells of any tenebrionid beetle. Strangely, I did not notice it. (Might be saying something about me!)
Geoff suggests additional reading: http://threatenedtaxa.org/index.php/JoTT/article/view/1492/2731