Key to males of Leptogenys unistimulosa group

Key to the known males of the Leptogenys unistimulosa group by Tozetto et al. (2022).

1

Compound eyes conspicuously enlarged. Width of frons at full-face view less than 0.45 of HW (Fig. 5A). Distance between lateral ocelli and compound eyes < 1 lateral ocellus length. OL/OES*100 = 166.7. In lateral view, apex of petiolar node bulging above posterodorsal angle (Fig. 5C) => Leptogenys elzasoares
Compound eyes not so enlarged. Width of frons at full-face view more than 0.45 of HW (Fig. 10A). Distance between lateral ocelli and compound eyes ≥ 1 lateral ocellus length. OL/OES*100 < 155, usually < 130. In lateral view, apex of petiolar node not bulging above posterodorsal angle; rather, node unevenly rising to the unevenly rounded apex (Fig. 3C, 8C, 10C) => 2

Mesoscutum about as broad as long: Mesoscutal anteroposterior length about equal to its lateromedial width, as measured at its greatest width, just anterad the tegula. Minimum distance between eyes ~ 1 eye length as measured in full-face view => Leptogenys bohlsi
Mesoscutum longer than broad: Mesoscutal anteroposterior length distinctly longer than its lateromedial width, as measured at its greatest width, just anterad the tegula. Minimum distance between eyes distinctly < 1 eye length as measured in full-face view => 3

Large species (HW > 1.43 mm, WL> 3.25 mm). Sculpture relatively more developed: disc of mesoscutellum striate; area between parapsides with dense, irregular, broad longitudinal to transverse grooving or totally rugulose. Restricted to the Brazilian Amazon and French Guiana => Leptogenys paraensis
Smaller species (HW < 1.43 mm, WL < 3.10 mm). Sculpture relatively less developed: disc of mesoscutellum largely smooth, with effaced striations; area between parapsides largely smooth, with sparse longitudinal grooving. More widely distributed, including Brazilian Amazon and non-Amazon regions,, Peru, and Venezuela => Leptogenys unistimulosa