The Diapriidae

Female apical sternite large, conical, longer than three preceding sternites (fig. 81); male A3 distinctly shorter than A4; marginal vein in forewing distinctly longer than stigmal vein (fig. 81); Nearctic and Neotropical [mf] (part)

Female apical sternite smaller, shorter than three preceding sternites (figs. 53, 56); male A3 subequal to or longer than A4; marginal vein in forewing usually shortened (figs. 60, 85), less frequently longer than stigmal vein (figs. 53, 56)