Imago"s flight activities of Protaetia brevitarsis were from mid June to early September, and those of Allomyrina dichotoma were from mid June to late August. These activities were mainly influenced by amount and duration of rain. They were more active when there was small amount and short period of rain in a year. Distribution depth of the 3<SUP>rd</SUP> larvae of P. brevitarsis were not affected to the temperature. But A. dichotoma were sensitively react to the temperature, almost larvae were near the surface when high temperature. The distribution of P. brevitarsis was not affected by humidity, but most of A. dichotoma were near the surface when high humidity. Larvae of P. brevitarsis usually ate their dead individuals. When we supplied as food the pork, chicken, fresh mackerel, bread, apple, and pear. They took all of these food but larvae of A. dichotoma took only bread. Two species were lived in similar environment but those feeding habit was very different.