FIGURE 3 in The neotropical stingless bee genus Nannotrigona Cockerell (Hymenoptera: Apidae: Meliponini): An illustrated key, notes on the types, and designation of lectotypes

FIGURE 3. Key couplet features of Nannotrigona species: A. N. mellaria, posterior margin of mesoscutellum with deep and semicircular emargination. B. N. melanocera (KU1381940, Bolivia, El Beni), posterior margin of mesoscutellum with shallower emargination. C. N. perilampoides (KU1382363, Mexico, Oaxaca), ocellocular area, between the lateral ocellus and the eye, with punctures almost similar to those on the frons. D. N. testaceicornis (KU1381957, Brazil, São Paulo), ocellocular area, between the lateral ocellus and the eye, with scattered and larger punctures separated by glabrous interspaces. E. N. testaceicornis (KU1381957, Brazil, São Paulo), clypeus duller, with minute, coarse punctures. F. N. punctata (KU1382096, French Guiana, Kourou), clypeus shiny, with minute shallow punctures.