Which ants do not nest outside in Maine and are only 1/16 inch long?

Pharaoh ants are recognized for their small size, typically measuring about 1/16 inch in length. They are unique among ant species in Maine for not nesting outside; instead, they prefer to establish their colonies indoors. This behavior makes them more common in residential and commercial buildings, where they seek out warm, humid environments and reliable food sources.

Pharaoh ants have a notable ability to proliferate within structures, which can lead to infestations if not managed effectively. Their preference for nesting indoors can often cause confusion with other ant species that do venture outside, but their size and indoor nesting habits specifically align them with the description provided in the question.

Understanding the characteristics and behaviors of Pharaoh ants is crucial for effective pest management, especially given that they can be particularly challenging to control due to their tendency to form multiple nests and their colony's adaptability.