1. Mesoscutum with
medial longitudinal furrow with cross-carinae (a, b) mimicking the adjacent
- Mesoscutum without
medial longitudinal furrow (A, B) … 2
2. Petiole shiny, often very long (a).
Mesopleuron with a band of heavy sculpture (b). Scutellum short, rounded (c) …
— Petiole sculptured, relatively short (A, B).
Mesopleuron at most with striations, without a band of heavy sculpture (A, B).
Scutellum produced into a spine, which may be blunt (C) … 3
3. Scutellum protruding posteriorly,
overhanging propodeum, sometimes as a spine, with similar reticulate-foveolate
sculpture over entire dorsal surface (a). Head transverse, distinctly wider than
mesosoma (b) …
— Scutellum usually not overhanging propodeum,
never as a distinct spine, smooth or more or less rugose, never rough reticulate
(A); typically a circumscutellar carina can be traced around the dorsal
circumference of the scutellum. Head rounded, only slightly wider than mesosoma