The Diapriidae

stigmal vein in forewing distinctly elongate (fig. 50); anterior margin of syntergite notched or excavate, often also flexed (fig. 49); apex of forewing often subtruncate to emarginate-cordate; Nearctic and Neotropical [mf] (part)

stigmal vein in forewing short (e.g., fig. 97); anterior margin of syntergite not notched or excavate, never flexed; apex of forewing rounded