Sterile males were used to study remating in Trogoderma inclusum LeConte. After mating, females are refractory to mating from 2 days until, in some cases, the end of their lives. Sixty-four percent of the females remated when kept in 6-cm-diameter vials but 83% remated when kept in 2-cm-diameter vials which indicates that crowding affects the percent of females that remate. The number of offspring was reduced by more than two-thirds when females, initially mated to sterile males, were placed with fertile males. This reduction was the result of the female tendency to lay most of her eggs before remating. Sperm from the 2nd mating took precedence over sperm from the 1st mating.