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Culex quinquefasciatus will in most cases be considered pest mosquitoes. In some areas, however, they are vectors of St. Louis encephalitis and bancroftian filariasis. A number of other mosquitoes that are also normally considered pest mosquitoes may be vectors of arboviruses. These mosquitoes are treated superficially because of the variety of larval habitats encountered and because of their limited medical importance. In many cases, they will cause complaints, and some type of action against them may become necessary.