Thief Ants
Solenopsis molestaThief Ant Identification
Pest Stats
Color
Pale yellowish to light or dark brown
Legs
Six
Shape
Unevenly rounded, thorax lacks spines
Size
1.5 mm - 2.2 mm long – one of the smallest household ant species
Antennae
Yes
Region
Throughout most of the United States
What do thief ants look like?
Thief ants are very small, typically only 1.5 mm to 2.2 mm long, with pale yellowish to light or dark brown colored bodies. Their thorax lacks spines and their bodies are unevenly rounded, their waste comprised of two nodes (round knobs).
Signs of Thief Ant Infestation
Although thief ants are very small, their infestations are noticeable. Homeowners may be able to see a trail of thief ants in their home if they have an infestation. This species is also known to leave trails from a food source to their nest. They may also come across the small ants in their food or cooking ingredients. Once they get inside, these intruders are commonly found foraging for food in kitchens, nesting in small spaces like cabinet voids and wall crevices, as well as behind baseboards and underneath countertops.
Thief Ant Infestation
Do thief ants bite?
Thief ants do not bite, though they do each have a stinger. However, their stingers are so small that they are rarely used effectively.

Thief Ant Education
Habits
Thief ants can gain entry via household cracks, holes and open doors. Once inside, thief ants nest in small crevices, woodwork and masonry around the home, using the wires in wall voids to travel from room to room. They commonly enter structures during hot weather in search of water and greasy, protein-rich food, such as nuts, breads, meats, fruits, animal fats, oils and dairy products.
Outside, they nest in exposed soil or under objects, in trash, rotten wood and cavities in trees. They will also feed on almost anything organic including insects, mealybugs, dead insects, seeds, and germinating seeds.
Thief ant mating swarms (nuptial flights) begin in late July and end in early fall. Colonies are composed of a few hundred to several thousand workers and many queens. Queen thief ants lay eggs, which then take about 50 days to a few months to develop into adults.
Threats
Thief ant control is important, as they may carry pathogens to human food after feeding on dead rats and mice. Because of their small size, they can make their way into packaged foods and are hard to remove without professional help.