Larval habitats and adult emergence sites of the dominant ceratopogonid species were identified from a 14.6-ha site on Sea Island, a coastal Georgia barrier island, during a 14-mo period.Culicoideslarvae (5,717) were identified from salt marsh soil samples and were compared on the basis of vegetation, elevation, pH, and soil minerals.Culicotdes furens(Poey) larvae were significant for vegetation and calcium ion content and were most abundant in areas ofSpartina alternifiora(1.2 m) at elevations near the mean low-tide mark. Numbers of larvalC. hollensiswere significantly related to vegetation and presence of potassium ions.C. melleus(Coquillett) larvae were significant for soil pH and were found in areas ofDistichlis spicataat elevations near the high-tide level. All species occurred in acidic soils (mean pH 5.6). Other ceratopogonids encountered wereDasyhelea atlantisWirth and Williams,D. mutabilis(Coquillett) andLeptoconops linleyiWirth and Atchley;L. ltnleyiwas found for the first time in Georgia. The relative seasonal abundance of the instars was compared with adult abundance. Lower larval densities ofC. hollensisandC. melleusduring spring and fall coincided with periods of adult abundance. Higher larval densities during winter and summer correlated with the bimodal spring-fall seasonal abundances of adultC. hollensisandC. melleus.