What is this tiny insect? I took this picture in central Mexico. The insect is about 1mm in size. I found lots of these dead on a desk, so many that at first I thought they were just dust. I assume they came from a plant that was above the desk.  Thanks a lot! ![enter image description here](

Since you suggest they come from a plant, they might be dried aphids. These insects usually feed on plant sap, and I already noticed some tiny, white, and apparently dead ones on plants.

As suggested in the comments, these are actually not dead aphids, but only the cuticle they leave after moulting, or ecdysis.