Couplet 20.
History
[1] Macropterous species
[7] Notaulices distinct throughout (except in _Synacra_;...
[8] Mandibles not forming a beak, the outer side of one ...
[12] Scutellum normally without any kind of sculpture pos...
[17] Mandibles very long, sickle-shaped and widely crossi...
[18] Marginalis never as short as this and at least as lo...
[19] Marginalis never longer than either its di...
[1] Macropterous species
[7] Notaulices distinct throughout (except in _Synacra_;...
[8] Mandibles not forming a beak, the outer side of one ...
[12] Scutellum normally without any kind of sculpture pos...
[17] Mandibles very long, sickle-shaped and widely crossi...
[18] Marginalis never as short as this and at least as lo...
[19] Marginalis never longer than either its di...
Postscutellum with a prominent angular process; scape very long, fully equal to the width of the head as seen from above; rims of the antennal sockets united, at their own level, by a a transverse keel. gaster beyond petiole very narrow, bright reddish-yellow) (part)
Postscutellum without such a process; scape shorter, considerably shorter than the width of the head seen from above; antennal sockets not united by such a keel (formerly Xenotoma Kieffer)