Appearance
bluebottle fly Shiny, metallic blue or green; 1/4- to 3/8-inch.

Appearance
drain fly Hairy or fuzzy, resembling a tiny moth; black or brown. About 1/4-inch.

Appearance
fruit fly Tan brown with red eyes; 1/8-inch.

Appearance
gnat Tiny flies ranging from 1 mm to 1/4-inch; black or brown, with very long thin legs and wings.

Appearance
house fly Usually gray, with four black stripes on their backs; less than 1/4-inch.