Zethus luzonensis

Selis, Marco, 2017, Revision of the Zethus luzonensis species-group (Hymenoptera: Vespidae: Eumeninae), with description of a new species, Zootaxa 4232 (3), pp. 444-450 : 449

Key to species of the Zethus luzonensis species-group

The characters used are applicable to both sexes unless the sex is specified.

1. Apical lamella of T3 indistinct, not clearly separated from rest of tergum; mesoscutum with large and dense punctures; pronotum and scutellum with distinct red markings; clypeus of male normally and weakly convex for all its length.......................................................................................... Z. celebensis Giordani Soika

- Apical lamella of T3 distinct, well separated from rest of tergum; mesoscutum with indistinct punctures, almost entirely smooth; ferruginous markings on thorax absent or limited to pronotum; clypeus of male frontally flattened, apically bent forming ventral horizontal portion........................................................................... 2

2. T3 preapically inflated, sparsely punctate, apical lamella regularly long on its entire width; S2 of male with an elongate deep depression with preapical lateral calluses; antennae black, apical flagellomere of the male rounded apically and reaching half of F7; anterior vertical portion of male clypeus semicircular in shape, apical margin without teeth; apical lamella of T2 of female black; apical margin of S3 of female with a punctate median lobe............................ Z. soikai sp. nov.

- T3 preapically flattened, densely punctate, apical lamella slightly longer in the middle; S2 not depressed, entirely flattened; antennae orange, apical flagellomere of the male pointed apically and reaching half of F8; anterior vertical portion of male clypeus triangular in shape, apical margin with two flattened, triangular teeth; apical lamella of T2 of female hyaline; apical margin of S3 of female simple.................................................... Z. luzonensis Giordani Soika