[1] Fourth antennal segment never modified; a sexual mod...
[2] Mandibles of ordinary form, short and only slightly ...
[6] Scutellum posteriorly with at most a single, short, ...
[10] Mandibles not forming a beak
[13] Marginalis rarely as long as this and then the radia...
[15] Propodeal keel simple
[17] Radial cell completely closed at apex
[18] Marginalis rarely even equal to its distance from th...
[19] Petiole at most about two and a half times as long a...
[20] Marginalis as long or nearly as long as it...
epomia sharply defined and extending from the angularly dentiform pronotal shouldar almost as far as the front coxa; at most a shallow cleft between the antennal sockets when the head is seen from above; mesoscutum densely pubescent; gaster beyond the petiole broadly oval
epomia represented at most by a short keel separating the side of the pronotum from the collar and not extending downwards towards the front coxae; when the head is seen from above there is a deep cleft between the antennal sockets which, in consequence, appear sharply discrete with their rims, on the inner side, well raised; mesoscutum rather sparsely pubescent and appearing highly polished. (Species of very slender build with the gaster beyond the petiole long and narrow; apical tergite somewhat flattened, polished and with its apical margin slightly upturned)