Small, white, flat-ish beetle that looked like it had been sprayed with ceiling stucco. Really! I thought it was a small piece of tissue paper at first. Dark or black shiny eyes (just two I think). Maybe it had six legs, maybe 8, I couldn’t tell from my pictures and I didn’t examine it closely enough (I just wanted it out of the house!). Found it at end of July inside the house, sitting on a wooden table near some of my motorcycle clothes on the ground, so it probably hitched a ride the day before while riding off-road through an open field of tall flowers near irrigation water. Scooped it up with a piece of paper, it didn’t run fast nor fly away, and I deposited it outside in the garden. Montreal Quebec, Canada
I believe 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.These nymphs can bite humans in self-defense when mishandled. The bite is said to be very painful.
Both the adult and nymph are predators. 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
Hopefully you just brought it in.