Carpenter Ant

Formally known as *Camponotus pennsylvanicus*, the black carpenter ant belongs to the Formicidae family, distinguishable by its characteristic single petiole node and evenly arched thoracic dorsum when viewed in profile, differentiating it from *Formica* species. Queens measure 13–16 mm, males 9–11 mm, and workers range from 6–13 mm, displaying polymorphism within the colony. A colony initiates with a founding queen, producing small 'minor' workers. After 3–6 years, the colony matures, potentially housing 10,000–50,000 individuals, eventually producing winged reproductives (alates) for dispersal. Developmental time from egg to adult varies significantly with temperature, but averages 6–12 weeks. Optimal development occurs between 21–32°C and high humidity.

Carpenter ants are predominantly nocturnal foragers, venturing out at dusk and returning before dawn, although minor worker activity can be observed during the day, particularly on overcast days or in shaded areas. They navigate using chemical trails (pheromones) laid by successful foragers, communicating food source locations and navigating complex routes up to 100 meters or more from the central nest. While generally not aggressive, major workers can deliver a painful bite and sometimes spray formic acid as a defensive mechanism if the nest is disturbed. Their excavation activities, particularly in structural timbers, compromise integrity by creating extensive galleries, leading to significant structural damage that can be mistaken for termite activity, underscoring their economic and public health impact.