Cerastipsocus trifasciatus (nymphs)
I found a cluster of these Barkfly (Psocoptera) nymphs under a rock. They were tiny, at about 2mm including the head, and only after I took a picture and zoomed it in (picture #3), was I able to figure out what they were. No idea about genus or species though.
Semi arid region in El Cimatario nature park, outside Queretaro.