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It was around 2-4 mm in length.


It's probably just the second instar (nymph) of a cockroach (Periplaneta americana).

Compare with this image of the instars:

enter image description here

Source: http://entnemdept.ufl.edu/creatures/urban/roaches/american_cockroach.htm

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  • $\begingroup$ Yikes! Thanks for the picture though, it looks like what I found. $\endgroup$ – Michael Wu Aug 6 '17 at 16:23

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