1	Forewing length less than 3.2 mm, wing venation greatly reduced and retrodorsal margin of metatibia without plumose setae; hind wing without closed cells, veins closing radial and cubital cells, if visible at all, clear and unpigmented (spectral); forewing with 2Rs and 1rs-m almost always completely absent, thus without indication of submarginal cells; at least distal part of second cubital cell of forewing undefined or defined completely by unpigmented spectral vein traces (i.e., at least 2Cu and 3Cu absent or spectral); vein M of forewing terminating without bend at about position of anterior end of 1m-cu which, however, is absent (i.e., 3M lacking)	2
–	Forewing length typically over 4 mm, wing venation typically not greatly reduced for Meliponini, but if minute and with some wing reduction, then retrodorsal margin of metatibia with plumose setae intermixed with simple setae; hind wing typically with radial and cubital cells closed by at least weakly brownish nebulous veins; forewing with one or two submarginal cells usually weakly indicated by nebulous traces of 2Rs and 1rs-m, first submarginal cell usually recognizable; second cubital cell of forewing completely indicated by at least faint nebulous veins (i.e., 2Cu present); vein M of forewing usually extending at least slightly beyond position of 1m-cu and angular at apex of tubular portion of vein (i.e., 3M present), the stub of which is usually at least faintly visible	3
2	Malar space shorter than flagellar diameter; inner margins of compound eyes converging below	2a
–	Malar space almost one-fifth as long as compound eye, much longer than flagellar diameter; inner margins of compound eyes nearly parallel	Pariotrigona Moure
2a	Yellow maculation present in worker on scape, supraclypeal area, clypeus, pronotal lobe and sometimes on lower parocular area, apically on mesoscutellum, and laterally on mesoscutum; scape without erect bristles; minutely plumose facial setae absent on upper frons; gonocoxae unmodified, with gonostyli articulating more distally; gonostyli elongate, bladelike, expanded and lamellate proximally; genital capsule rectigonal; metasomal sternum VI medioapically chamfered, bilobed	Ebaiotrigona , gen. nov.
–	Yellow maculation lacking, at most with pale yellow brown areas; scape with erect bristles; minutely plumose facial setae extending across upper frons; gonocoxae with enormous, arched, proximal extensions, with gonostyli articulating near midlength; gonostyli slender elongate; genital capsule schizogonal; metasomal sternum VI with a single medioapical process	Lisotrigona Moure