The Velvety Tree Ant (Liometopum occidentale) is reddish-brown head and thorax; velvety black abdomen and typically measures ⅛–¼ inch. The velvety tree ant (Liometopum occidentale) is a medium-sized ant found in the western United States, including Arizona's higher-elevation areas and wooded suburbs. Workers have a distinctive appear.

The Velvety Tree Ant is generally low-risk, but caution is still advised. Bites readily when disturbed — bite can be painful. Foul odor. Minor structural damage from wood nesting. Not medically dangerous.

In Arizona, velvety tree ants are most often encountered in the following situations: Fast-moving reddish-and-black ants on trees, fences, or exterior walls. Foul odor when ants are crushed. Nests in dead wood, tree cavities, or structural wood. Trails on tree trunks leading to aphid colonies.

The Velvety Tree Ant is most active during: Spring through fall; most active in warm months. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.

Trim trees and shrubs away from the structure. Remove dead wood and stumps. Treat tree trunks with sticky barriers to prevent access to the structure.

Non-repellent insecticide applied to nesting sites and foraging trails. Perimeter treatment. Address aphid infestations on trees to reduce food source.

Most store-bought ant sprays kill only the workers you see, while the queen and colony remain protected underground. Effective Velvety Tree Ant control requires baiting or targeted colony treatments that workers carry back to the nest. Pest Control Bros uses professional-grade products and application methods that address the entire colony.