House centipedes are one of the most common house-critters here in the midwest.
They are fairly good to have around. They'll eat any other pests, like roaches and ants.
They can bite, and have very mild venom, but this is pretty harmless and very rare. They can get huge (you should see the cave varieties).
As for the OP, the second picture is a Hydroptilidae, more specifically, probably a Agraylea sexmaculata.
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