Phormia regina

Introduction:

The black blow fly's wings are specialized with a sharp bend. These flies also have well-developed calypters. Blow flies generally are about the size of a house fly or a little larger, and many are metallic blue or green in color. Key characteristics of this species include black gena, mostly white calypters, and anterior thoracic spiracles that appear to be orange yellow due to being surrounded by bright orange setae. Following successful mating encounters, the adult females are then attracted to decaying material rather quickly for oviposition, allowing forensic entomologists to use development stages of larvae as a clue in determining an approximate time of death.
Life Cycle:

Size 0.5-0.75 inch (6 and 14 mm)
Sexual Dimorphism: false
Metamorphosis: complete (egg, larva, pupa, adult)