none The mating frequency between males and females of C. flavipes with and without relationship was investigated, being registered the mean time for the beginning of copula and the mating duration. The mean number of descendants produced by virgin females, brother times sister crossings and non-endogamic matings was also estimated. The partners origin did not affect the mating success of C. flavipes couples from both groups. The mating frequency registered in these two experimental conditions was 69%. No difference was registered in relation to the mean time for the beginning of copula between related and non-related partners. The same was observed in relation to the mean values of mating duration registered for both types of couples.