I'm not sure what qualifies for tuberculate, but I did see 4 "bumps" in a transverse arch across the head. The middle 2 appeared like they might have a tuft of setae, but I honestly just can't definitively see any dark setae on the dark head, even at high aspect angles. Downie and Arnett's key appears to point to T. tuberculatus, although T. capillarus seemed to also be possible. But there appears to be an inconstancy at couplet 21 where "pronotum with sides parallel" is required to reach T. tuberculatus, yet the description (and the specimen) states "pronotum with sides more convergent to apex".

Thanks for your grace on the photos :) I certainly struggled to get some recognizable head shots (see new linked images). I'm currently using a point and shoot, and just tried holding it up to my stereo scope. I was even more disappointed with the resulting shots compared to the detail I was seeing visually - until I closed one eye and saw what a difference stereo vision makes (duh!).

Tim

Jim, my apologies for the poor image quality, but I rechecked this guy and both this and the lighter "Trox" I posted just prior have 3 segmented lamellate (loosely) club antenna (covered by those huge bicepts:), which would seem to lean more toward the Scarab/Trog, than Tenebrionidae. The underside seems a bit more "armored" than the B. corti*colla image from your series. Does any of this help? I still have the little bumpy fellow if you need any other detail.
Thanks,
Tim

You must be right then. I suppose you could give it a bath and a scrub to get a little more detail.