Abstract
The distribution of adult red flour beetles, Tribolium castaneum H., was observed in and around the food (plain flour+10% dried yeast powder) in each container the bottom of which was covered with a piece of cotton gauze or a sheet of cardboard. Most of the adults did not enter the food because they could'nt climb the smooth wall of the food case. Most of the adults, however, entered the food as soon as the wall was covered with a piece of tissue paper. This suggests that the starved adults did not fly to food at least for 5 days during the experiment. After they ate the food, a substantial number of the adults were out of the food, and got together at the confined places, especially between the gauze and the bottom of the container.
