Genus Prenolepis Mayr

P. i m p a r i s Say is very common in mesic habitats at low and medium elevations throughout most of the state. Nests are located deep in the ground, and workers do not forage during the hottest periods of summer. A collection of unusually small alate queens from one locality in the foothills of the Sierra Nevada appears to represent a second, undescribed species, which might be a social parasite of P. imparis (Wild 2002) . References: Creighton (1950a), Fontenla (2000), Lynch et al. (1980), Smith (1965), Tschinkel (1987), Wheeler (1930c).