Has a rough looking flat grey body on six brown hairy legs. Two long antennae at top of head. No wings visible. Less than 1″ in total length (tip of antenna to end of last set of legs). Found in wheat farm area of eastern Washington state.
Your insect is the nymph stage of a true bug called masked hunter. This is in the assassin bug family, so they are predators on other insects.
Nymphs exude a sticky substance that causes dust, lint, and other small particles to adhere to the surface of their body. This camouflage may help the nymph avoid detection by both predators and prey. Yours does not have much dust on it yet.
Both the adult and nymph are predators. They are found around buildings and in wooded areas; both are attracted to light. They prefer dry habitats and if found in the house there are never very many. They are said to feed on woodlice(think pillbugs or rolly pollys that do not roll), lacewings, earwigs,and bedbugs.
These nymphs can bite humans in self-defense when mishandled. The bite is said to be very painful.