Blow Flies (Bottle Flies)
Like other true flies, blow flies have only one pair of wings, short antennae, and large compound eyes. Distinguishing them from other kinds of flies, blow flies are often shiny, metallic, blue, green, or black, with hairlike bristles. Special details of antenna anatomy, wing venation, and placement of body bristles are used by experts for exact identifications.
The larvae are grublike maggots that are tan, whitish, or brownish.