The first large-scale dengue fever epidemic in Hawaii occurred in the late 1840s; a second outbreak occurred at the turn of the century, with an estimated 30,000 cases (1, 3) . During those periods Ae. aegypti was widespread in Hawaii (4) . Epidemic dengue occurred again on Oahu in 1943 to 1944, when 1,498 infections were reported, mostly in urban areas of Honolulu (5) . Ae. albopictus had been introduced into Hawaii at the beginning of the century, and by 1940 it was the dominant day-biting Stegomyia mosquito species in the islands (4, 5) .