A study was conducted to determine the oviposition preferences of certain permanent and floodwater mosquitoes relative to selected Louisiana marsh plants.Culex salinariusCoquillett showed a significant (P<0.01) preference forDistichlis spicata(L) Greene habitats in both the intermediate and brackish marsh impoundments (2.07 and 1.15 larvae/dip, respectively).Anopheles bradleyiKing was collected in association withSpartina patens(Ait) Buhl. habitats in significantly (P<0.01) higher numbers (0.12 from the intermediate and 0.21 larvae/dip from the brackish marsh impoundment) than in association with other plant species.Culiseta inornata(Williston) was collected only in the intermediate marsh impoundment in association withD. spicata(0.13 larvae/dip).Soil samples fromD. spicatahabitats contained significantly (P<0.01) moreAedes sollicitans(Walker) eggs thanS. patensorBacopa monnieri(L) Wettst., yielding 52% of the eggs collected.