The Diapriidae

marginalis very long, hardly shorter than the radial cell and at least as long as its distance from the basalis; radial cell always completely closed. (Petiole much longer than wide; the spurious medius is almost straight and distinct right to edge of wing)

marginalis rarely as long as this and then the radial cell is open at apex or the medius is very indistinct and fades out long before the edge of the wing (Pantolyta_); or if the marginalis nearly as long as its distance from the basalis then it is distinctly shorter than the class/show/5548" class="passed">radial cell