An epidemiological investigation of DHF outbreak was done from November to Desember 1976 in Bantul, which is an agricultural district located 25 kilometers south east Jogjakarta, Central Jawa. One hundred and twenty six cases were studied and 97 or 73% were confirmed as dengue infection, the case fatality rate was 3.1%. The median age was 7 years and male to female ratio was 1:1.8. Clinically the observed cases ranged in severity from undifferentiated fever to shock and death. Dengue type, 1, 3 and 4 were isolated but dengue 3 was the predominant virus with 60% (27) isolates. Dengue type 1 and 4 were isolated also in equal numbers. Both A. Aegypti and A. albopictus showed a diversity of breeding habitats. While A. aegypti preferred the large cement tans and A. Albopictus cut bamboo stumps, there was considerable overlapping many breeding sites were shared by the 2 species.