Thanks for the comments, guys!
Doug, what puzzles me about the mouthparts is that when I glanced at one of these critters under my low power stereo 'scope, I thought that what I'd see in this view was an uninterrupted plate over the mandibles, with the various palps sticking out from underneath. Given that assumption, I can't explain what looks like a dark toothed structure on the right. And since I'm, oh, about 3000 miles away from the bug at the moment, it's going to have to remain a mystery for a while. I guess that's OK, though. I thrive on mysteries...
--Rik