This little jumping dust bunny has antennae and I think 6 legs. Our 4-year-old found them on his shoe. It is a Masked Hunter Nymph and will likely grow to be about 20 mm. The nymphs have sticky goo that coverts their bodies and use their back legs and a tarsal fan to stick dirt all over themselves. They like to eat bed bugs and other tiny critters.
Dust in the front porch
The adults can give a bite comparable to a bee sting.