I have found Trichocolletes venustus in Uriarra SF, but T. orientalis and T. aeratus are the species that turned up on Black Mountain. I can't tell from the photo whether or not this is a male T. aeratus.
I suspect you are correct - no specimen for this one. I have male T. aeratus and T. orientalis from previous years but not T. venustus on Black Mountain (yet).