Univariate and multivariate one-factor analyses of variance (ANOVA and MANOVA) were applied to examine the effect of the “gender” factor on some measurements of diapausing larva and cocoon in Neodryinus typhlocybae (Ashmead) (Hymenoptera Dryinidae). This species was introduced into Italy in 1987 for the biological control of the Nearctic planthopper Metcalfa pruinosa (Say) (Hemiptera Flatidae). Five measurements were taken of each specimen: length (Le) and width (Wi) of the cocoon wall; length (le) and width (wi) of the larval chamber and length of the diapausing larva (dll). Results of MANOVA indicate that all the considered morphometric variables are influenced by the “gender” factor. Results of ANOVAs indicate that length and width of the larval chamber and the length of the diapausing larva are the variables more strictly correlated with the gender.