The results of adult mosquito collections on 12 U.S. Military Installations located in five provinces in Korea from 1995 to 1996 are presented. New Jersey light traps were operated for adult collection from 15 May to 15 October each year. This surveillance was performed to determine when to recommend insecticide spraying for mosquito control to these Army installations. A total of 39,738 and 24,318 adults were collected in 1995 and 1996 respectively, being comprised of 34,750 (87.4%) females and 4,988 (12.6%) males in 1995, and 19,231 (79.1 %) females and 5,087 (20.9%) males in 1996. Among the total 20 species comprising 6 Genera, Gulex tritaeniorhynchus (43.9%), Anopheles sinensis (25.0%), Culex pipiens pallens (20.9%) and Aedes vexans nipponii (9.4%) were most common species. A density increase of almost 12.7% ofthe Anopheles sinensis proportion from 1995 to 1996 and a decrease of 31.6% for the Culex tritaeniorhynchus proportion was observed for the same years.