Archaeognatha

These little insects are ancestral - they have anatomical features that remarkably resemble fossil species. They have no wings, and the mouthparts are rudimentary (Archaeos = ancient, gnathos = mouth). They're also covered in scales, like the much more derived Lepidoptera, but they're flat, thin, simple scales (unlike butterfly scales that have grooves, ridges and the like).

Found on a tree during a midnight hike.