Thought it was an ant at first.
Tiny, looks black
Este espécimen permaneció inmóvil por varios segundos y luego emprendió vuelo.
Tiny fly, 2-3mm long. Photos 2 and 3 lightened with editing.
Larva? The yellowish end is the head, which was moving.
This was crawling quickly up the tree, so best shot I could get. Maybe someone can recognise the pattern on abdomen?