Couplet 16.
History
[1] Macropterous species
[7] Notaulices distinct throughout (except in _Synacra_;...
[8] Mandibles not forming a beak, the outer side of one ...
[12] Scutellum with a row of foveae across its posterior ...
[13] Petiole at most one and a half times as long as its ...
[14] Four discrete ring segments between these two tergit...
[15] Base of large tergite with a transverse ke...
[1] Macropterous species
[7] Notaulices distinct throughout (except in _Synacra_;...
[8] Mandibles not forming a beak, the outer side of one ...
[12] Scutellum with a row of foveae across its posterior ...
[13] Petiole at most one and a half times as long as its ...
[14] Four discrete ring segments between these two tergit...
[15] Base of large tergite with a transverse ke...
Notes: Species keying to here are currently considered to be in Lyteba.
marginalis not longer than stigmalis and only about one-third as long as its distance from basalis; side of scutellum without a free hook-like projection; post-scutellum without a spiniform projection (part)
marginalis much longer than stigmalis and about three-quarters as long as its distance from the basalis; side of scutellum with a free hook-like projection; postscutellum usually with a conspicuous spiniform projection. (Keels joining rims of antennal sockets behind, pushed forwards to form an angular projection visible when the head is seen from above and slightly from behind; at most the 9 distal segments of the antenna tending to form a darkened club)