This mistaken identity is due to morphological and behavioral characteristics they share with carpenter ants; namely polymorphic workers, a smooth convex thoracic profile, and the tendency to excavate wood.

Consequently, their importance as structural pests may be greatly under reported, especially in California, Oregon, and Washington, United States.

They inhabit pine, oak, Douglas fir, and juniper forests, sagebrush, and high-elevation riparian habitats.

The fewer ants founding together (3 or less), the more time spent per individual caring for brood, ovipositing, and exploring.

[6] Liometopum luctuosum is also an omnivore and has been observed feeding on secretions from both plants and insects such as aphids, membracids and scales, as well as miscellaneous foods such as meat, eggs, fruit and bread.

[7] Reproductives of L. luctuosum have been observed flying in June and July and can be collected the day after the nuptial flight in large bodies of water or using a blacklight trap.