Lasius aphicola is the North American version of the European Lasius umbratus. Being a Lasius social parasite, these queens require host workers to start colonies, preferably around 20. The queens lay their own eggs which are cared for by the host workers until the hosts are slowly replaced by the parasitic workers. The workers of Lasius aphidcolus are a reddish-orange, and though subterranean in the wild, can forage well in captivity. This species does well with higher levels of humidity 60-80% in order to simulate their natural subterranean habitat.