Flight Dimorphism in the Yellowish Elongate Chafer, Heptophylla picea MOTSCHULSKY(Coleoptera:Scarabaeidae)

概要

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Flight ability was examined with a flight mill for field-collected adults of the yellowish elongate chafer, Heptophylla picea. The proportion of fliers was much lower in females than in males. However, the flight ability, as determined by flight distance and speed, of the female fliers was not inferior to that of the males. In either sex, no significant difference was found in body weight, the area of the hind wings and the ratio of wing area to body weight between non-fliers and fliers. On the other hand, female non-fliers lacked flight muscles, while all female fliers and males had well-developed flight. Hence, the females of this chafer shows a flight dimorphism associated with development of flight muscles.
1991-05-25