Abstract
High population densities of 2 dytiscid beetles, Laccophilus fasciatus Aube and L. maculosus Say, occur in some waste-oxidation lagoons in Missouri. These lagoons provide optimal conditions for reproduction to certain dipterous pests, notably mosquitoes and midges. In laboratory studies, adults of both dytiscid species were very active and voracious predators on the immature stages (especially the younger instars) of Culex pipiens L., and Glyptotendipes barbipes (Staeger). Mosquito pupae were less often attacked than larvae. G. barbipes were subject to predation before and during tube construction, when larvae left the tubes, and, as pupae, when they migrated to the water surface for adult emergence. The 2 Laccophilus species differed little in their predaceous capacities, and no difference was found between the sexes of either. Predation occurred to some extent under greatly reduced illumination.
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