This is a macro photograph of a very small (less than 1/3 inch long) green Halictid or "sweat bee". The common name "sweat bee" comes from their attraction to water or salt in perspiration. Halictidae belong to the Hymenopteran superfamily Apoidea, series Anthophila. This one is, I believe, either Agapostemon or Augochlorini. If you know for sure, please let me know and I'll correct this description. Halictids, or native bees, nest in the ground and are extremely important pollinators. If you look closely, the light colored pollen is clearly visible on the antenna and hair.