Zetheumenidion Bequaert, 1926

Selis, Marco, 2024, Revision of the Afrotropical genus Zetheumenidion Bequaert (Hymenoptera: Vespidae: Eumeninae), Zootaxa 5406 (1), pp. 37-65 : 38

Genus Zetheumenidion Bequaert, 1926

Zetheumenidion Bequaert 1926: 487 , subgenus of Eumenes Latreille.

Type species: Eumenes femoratus von Schulthess, 1910 , by original designation.

Diagnosis. Distinguished from other genera of Eumeninae by the following combination of characters: mandibles elongate with five pointed teeth; palpal formula 6–4, palpi long and narrow and with sparse setae; cephalic foveae small and close to each other, bearing a small tuft of short setae and not placed in a differentiated area; mesosoma at least weakly depressed dorsoventrally; pronotal carina lamellate; tegula with strongly rounded outer margin, posterior lobe short and not equaling parategula; axillary fossa large and circular; metanotum evenly rounded; mid-line of propodeum simple, not foveate or carinate; propodeal orifice long and narrow, with narrowly rounded apex; propodeal valvula free and rectangular; transition from mesepisternum to epicnemium at least partly abrupt, but epicnemial carina absent; hind femur of female ventrally flattened and somewhat curved; hind femur of male strongly swollen, with a flattened or depressed area on ventral face bearing a spine-bearing pore; hind tibia of male ventrally depressed and curved; T1 strongly petiolate and more or less of regular width from base to apex, weakly expanded only at level of spiracles and at apical margin; apical margin of T1 not inflated, bearing a lamellar “hood” covering basalmost part of T2; sides of T1 fused on ventral face, S1 reduced to a small apical sclerite which is wider than long and deeply emarginate posteriorly; T2 basally petiolate, petiole at most as long as wide; apical area of T2 strongly raised in front of apical lamella, which is basally costulate; S2 apically lamellate; prestigma very short, about as long as wide; second submarginal cell sessile, basally acute and receiving both recurrent veins; third submarginal cell with posterior margin much longer than anterior margin.