The Diapriidae

Marginal vein in forewing remarkably long, 3.3–5.5 times as long as stigmal vein (fig. 40); cheek with fan of striae reaching lower orbit of eye (fig. 40); petiole remarkably elongate, subequal in length to or longer than rest of metasoma; mesosoma and petiole often with rough rugulose sculpture; no short-winged forms known; Central and South America; [mf]

Marginal vein in forewing at most 3 times longer than stigmal vein, usually shorter; cheek typically nonstriate, very rarely with short fan in lower part, striae never reaching lower orbit (short-winged forms occur)