Couplet 15.
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 ...
[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 ...
Base of large tergite with a transverse keel on each side of the middle furrow. (In Oxylabis tuberculata_, the keel is sharply defined only at extreme lateral class/show/4526" class="passed">corner)
future couplets
Marginalis not longer than stigmali... ...
Belyta Jurine
Marginalis much longer than stigmal... ...
Oxylabis
Base of large tergite without trace of such a keel (marginalis full half as long as its distance from the basalis; gaster beyond petiole short and broad; scutellar fovea transverse and as wide as the distance between the notaulices behind) (part)