Of the seven species of Culicoides found in Grand Cayman, C. furens (Poey) was by far the dominant species. Only C. furens and C. insignis. Lutz were taken in emergence traps. The density of emergence of the former was greatest in mangrove swamp and the latter in fresh water reed swamp. Within the mangrove, emergence of C. furens was not evenly distributed but favored bare mud over mud with pneumatophores and non-tidal rather than tidal areas. Most non-tidal bare mud occurred around mangrove pools in the lower, wetter parts of the swamp. C. furens adults were present all year but with major peaks of abundance in late spring and early winter. Peaks were variable from year to year and variably demonstrated by different collecting methods. Light and emergence trap catches showed a very close relationship with swamp water levels and a lesser relationship with temperature.