Wings with two cubital cellules; the transverse cubital nervure and the cubitus near it obliterated, so that the first cubital cellule is not separated from the second and from the discoidal. Radial cellule wide, reaching to the apex of the wing; the transverse median nervure is almost interstitial. In the hind wings the radius and cubitus are continued to the end of the wing; the præbrachial nervure is interstitial; the probrachial is widely separated from it. Antennæ filiform. Thorax distinctly trilobate; all the lobes raised and clearly separated. Scutellum roundly convex. Median segment not quite so long as the mesothorax, slightly depressed at the base, and slightly curved upwards; closely rugose. Abdomen with a short projecting ovipositor; the petiole is not quite so long as the second segment; the base behind the tubercles is distinctly narrowed; from there it becomes gradually, but not much, thickened towards the apex; the basal half is distinctly grooved on the lower side. Legs slender.
Allied to Meteorus, from which it differs in having only one transverse cubital nervure, and in the cubital cellules being confluent, through the obliteration of the nervures, with the discoidal at the recurrent nervure. We find an obliteration of the nervures and a consequent fusion of the cellules in Perilitus, &c.; but in these it is the base of the cubitus which is obliterated, so that the first cubital cellule becomes united with the prædiscoidal, while in the present genus these are separated, the cubitus being distinct at the base.
The radial areolet in the hind wings is not geminated by a transverse nervure.