Abstract: The flight performance(speed and duration)of adult alligator flea beetle(Agasicles hyraphila)was studied by applying the flight mill.Our results showed that there is only a short period(<3min)flight for a large proportion of female and male individuals tested.In contrast,a small proportion of adults(3%of females and 1%of males)had capacity for long-distance flight(>3min).Meanwhile,the flight duration of female adults was longer than that of males and the longest was recorded at 1.51hby a male adults.Furthermore,the average speed of female and male was 23.07cm·s-1 and 27.72cm·s-1 respectively.Our results indicate that the flight speed of males is faster.