Abstract
In the beetle Exechesops leucopis, the male eyestalk is extremely elongated compared with the female's, and thought to be used in male-male combat for mates. In this study, in order to know the importance of visual cues in their activities, locomotion of 2 males and 2 females was monitored for 4 days using actography which records interruptions of a fine infrared beam by insects as pulses on the chart. As a result, locomotory activity was restricted to in the light period and, thus, development of the visual sense may be correlated with their diurnal activity.
