Adult mosquitoes were collected on 31 nights during 1 August through 21 October 1976, at Clark Air Base, Republic of the Philippines. Six CDC miniature light traps were operated with either carbon dioxide (dry ice) bait or incandescent light as the attractant on alternate nights. Collections were made at fixed locations, 50 to 150 meters apart, along both sides of a stream on Clark Air Base. A total of 10,099 female mosquitoes was collected; of these 9,825 (97.3%) were captured using CO2 while 274 (2.7%) were caught using incandescent light. Four species were taken only with the light traps while 22 species were collected solely in the traps baited with CO2. Ten genera and 51 species were represented in the collections.