Sex determination inn insects becomes a pre-requiste for studies such as sex attractants and sterility induction.wherein there is need for rapid sexing of large numbers of insects in Lepidoptera.pupae are known to possess differences the sexes(Jackson,1890:Poulton1890)Such differences have been first made use of in sexing the Egyptian cotton leaf worm(Prodenia litura F.)by Flaschantrager et al.charact- ters such as position of genital openning.number of visible or movable abdominal sagments,color and location of the spiracles seem to be useful Solomon.1962).With tis background,attempt was made to identify sexual differences in the pupae of the sorghum stalk borer.Chilo zonellus.for sterilization studies and the observations are presented herein.
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