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Diptera: Drosophilidae, Drosophila melanogaster.

These are the most common species encountered in homes and other structures: the Fruit Fly (sometimes known as pomace flies or vinegar flies). These pests can be found throughout the world, in homes, food processing plants, warehouses, grocery stores, wineries, restaurants and other structures. They are small flies measuring about 1/8 inch in length, including their wings. The identifying characteristic of the fruit fly is its eyes, which are red in color, tan head, and a tan thorax,  with the abdomen somewhat darker. This fly is commonly mistaken for the phorid fly  which has very similar markings but lacks red eye color. They are very common in and around drains, garbage cans and organic debris surrounding  legs of appliances. The fruit fly breeds in and feeds on ripened fruits and vegetables, as well as moist, decaying organic matter. Fruit fly larvae living in fruit which is eaten can cause intestinal discomfort and diarrhea. In vinegar-producing facilities, the fruit fly is responsible for infecting tanks of vinegar with a tiny nematode called the vinegar worm.