A wild Bruchid Kytorhinus sharpianus has several characters peculiar to stored bean pests. Its life cylce was investigated in the field and it was found to the host plant, Sophola flavescens, in mid June. Females oviposited on small pods just after seeds had been borne. The first generation larvae developed within the fresh growing seeds and emerged as adults in mid August. The adults soon laid eggs on matured pods. The second generation larvae fed on matured-dry beans on the standing plants and adults emerged at the end of September. Eggs were the laid directly on dry beans inside the split pods and the beans were infested by the third generation larvae. The developmental period of K. sharpianus larvae fed on dry host beans was studied in the laboratory under various temperature conditions. The higher the temperature was, the earlier adults emerged. Males emerged several days earliery than females. Oviposition without feeding after emergence was found in summer insects but not in wintering insects in the laboratory. The dry bean infestation of K. sharpianus seems particulary adapted to the life cycle of S. flavescens, which has the longer period from flowering to the matured-dry bean state. The process of estabilishement as a stored bean pest was discussed.