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Mandibles forming a short, triangular beak, the outer edge of one of them, seen from in front, more or less straight. (Small spp. not more than 2.5 mm. with the marginalis always at least as long as its distance from the basalis and the petiole at most hardly longer than its apical width; radial cel, if closed, very short, never longer than the marginalis; gaster narrowly pointed at apex and more or less compressed here, the hypoygium in the form of a narrow sheath enclosing the two apical tergites; gaster posterior to large tergite with 4 clearly defined ring segments and 2 narrow, not sharply separated, apical segments (7 and 8); ovipositor very long, normally concealed but in dead specimens sometimes far exerted)

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