Abstract
In the yellowish elongate chafer, Heptophylla picea MOTSCHULSKY, collected from tea fields in central Japan, all male adults had well-developed flight muscles, whereas most female adults did not have them. This indicates that there is a flight muscle dimorphism only in the female adults. Female non-flyers did not retain any flight muscles even just after eclosion. These adults reserved fat-body in their thoracic cavities. The ovaries of female adults without flight muscles developed with the degeneration of fat-body. Accordingly, the ovaries of female adults had already matured when they emerged on the ground. The number of eggs in ovaries of female adults collected from tea fields just after their emergence on the ground was lower in those with flight muscles than in those without them. This indicates that the latter ones were earlier in the development of ovary than the former ones.
