Type locality: San Pedro, Jujuy Province, Argentina.
Disease relations: Specimens of Culex maxi were found naturally infected with the Venezuelan Equine Encephalitis virus during 2003-2004 in Chaco Province, Argentina (Pisano et al., 2010).
The immature stages were found in a variety of water bodies, including temporary and permanent ground pools, irrigation channels, stream margins, swamps, swimming pools (Almirón & Harbach 1996), and natural breeding sites in the presence or absence of grasses (Stein et al. 2011). The habitats are either shaded or in open sunlight, the water ranges from clear to turbid. Larvae are usually found in stagnant water, but they also occur in slow-moving water in the presence of aquatic plants. Immature stages were also found in disused tires, swimming pools, and metal and concrete containers (Campos et al. 1993, Almirón & Brewer 1996). Associated species include Nyssorhynchus albitarsis, Nyssorhynchus argyritarsis, Anopheles neomaculipalpus, Anopheles argentinus, Ochlerotatus albifasciatus, Culex acharistus, Culex apicinus, Culex bidens, Culex brethesi, Culex dolosus, Culex mollis, Culex pipiens, and Culex saltanensis. Immatures and adult specimens of Culex maxi have been collected year-round in temperate regions.