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About 1mm long.
I would have thought this was nothing more than a speck of dirt had I not seen it scurry around. When it moved it moved in quick bursts. A member of the Psocoptera or Booklice order of insects, in the family Trogiidae or Granary Booklice. They feed on stored grain. I have no idea what it was doing in my bathtub. ID'd at BugGuide by v. belov. 26