You have "thrips"
only way to know is to taste em with egg nog,merry xmas
Do they fly? If they fly more than likely are leaf hoppers and were brought in by ants foraging for food. They collect the "honeydew" excrement of leaf hoppers.
Definitely thrips. Either use a synthetic pyrethrum, or insect soap. You can put up some cheap sticky traps to catch the flyers that don't get the soap. My buddy kills all his bug problems with a tobacco/nicotine spray, just a pain to make.
Just spraying with water jacks them up pretty good. They can't move through the mist/water an atomized sprayer makes.
Oh, they are attracted to blue and pink by the way. So if you get a sticky, make sure it is the one with the pink stripes.
Thrips fly also. If it is leaf hoppers, then use a black trap.