Notaulices wanting; head strongly transverse; antennae not inserted on a frontal prominence, the sockets opening forwards, not upwards and close to clypeus (fig. 58); scutellum posteriorly raised high above the level of the postscutellum and, except anteriorly, margins more or less distinctly throughout (fig. 56). (radial cell short, closed; marginalis fully as long as its distance from the basalis; hind tibia thickened and abruptly narrowed at base; only 5 clearly defined segments beyond large tergite, the eight being hidden beneath the large seventh)
Notaulices distinct throughout (except in Synacra_; antennae inserted on a frontal prominence, the sockets opening upwards; scutellum often domed but never raised posteriorly above the level of the postscutellum and never the semi-circular name/margin" class="failed">margin characteristic of Ismarus