I'm not sure, but I think this is some sort of Mite.  It's not an insect.  Insects have six legs, and this has eight.  Almost certainly an Arachnid.   A fairly common critter, but not easily noticed because it is so tiny.  Spend some time staring closely at a concrete curb, and you'll probably see them—tiny bright red or orange spots, too small to see much more detail bare-eyed, moving with surprising speed.   Arcari Acarina Macro