Abstract
Young adult males of the flour beetle, T. confusum, have been shown to require about four days, following eclosion, to reach sexual maturity. Subjecting two or three day old males to 1450 or 2900 r of x rays depresses their fertility, as evidenced by the increase in the percentage of inviable eggs produced by their mates. This inviability, probably due in part to the induction of dominant lethals, reaches a maximum value 11 to 12 days following irradiation and then declines. In general, the pattern of response suggests that the various stages of spermatogenesis of T. confusum are differentially sensitive to x-rays. No evidence was found for recovery of irradiated sperm stored by females, or of extended effects on the fertility of the treated males. (auth)
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