Muscidae
General description:
Slender to robust, usually strongly setulose flies, usually dull in color, black, gray, or yellowish, sometimes bright metallic blue or green, rarely with brightly colored hairs and resembling bumble bees; wings usually unmarked, sometimes with crossveins clouded, rarly with more extensive markings. Lenght 2-14 mm. (Huckett & Vockeroth 1987)