Menestheus cuneatus
Identified as Menestheus cuneatus on Bowerbird by Tony D.: "Menestheus cuneatus : http://agspsrv34.agric.wa.gov.au/ento/images/M_cuneatus.jpg Paramenestheus (2spp.) is most similar and also found in your area but the head in that genus is only slightly longer than the pronotum and is more rounded anteriorly (ie not so pointed)."