Key to Luciuranus species (males only)

1 - Pygidium up to 2x longer than sternum VIII greatest length (Fig. 12)............................................ 2

1’- Pygidium at least 3x longer than sternum VIII greatest length (Fig. 68)........................................... 4

2 - Eye big (slightly narrower than distance between eyes), pygidium with median third sinuose (Figs. 6, 10) (Serra da Man- tiqueira Mountain Range)............................................................. L. magnoculus sp. nov.

2’- Eye small (half as wide as distance between eyes), pygidium with median third rounded (Figs. 34, 38) (Serra do Mar Mountain Range: Serra dos Órgãos Massif)......................................................................... 3

3 - Sternum IX with apices truncate, arms with internal margins subparallel; parameres with stout basal projections fused medially (Figs. 43, 44) (Serra do Mar Mountain Range: Serra dos Órgãos Massif)........................ L. desideratus sp. nov.

3’- Sternum IX with apices acute, arms with internal margins divergent posterad, stout basal projections touching basally (Silveira et al. 2016: Fig. 33)............................................... L. josephi Silveira, Khattar & Mermudes, 2016

4 - Pygidial groove present (Figs. 67, 68)..................................................................... 5

4’- Pygidial groove absent (Figs. 84–85) (Serra do Mar Mountain Range: Tijuca Massif).......... Luciuranus carioca sp. nov.

5 - Lateral margins of pygidium subparallel, with a medial subquadrate projection (Silveira et al. 2016: Figs. 52–54) (Serra dos Órgãos Mountain Range)............................... Luciuranus jameshooki Silveira, Khattar & Mermudes, 2016

5’- Lateral margins of pygidium strongly convergent posterad (Silveira et al. 2016: Figs. 73–75).......................... 6

6 - Arms of sternum IX slightly asymmetric in length, symmetric in apical width (Figs. 69–71)..... Luciuranus takiyae sp. nov.

6’- Arms of sternum IX strongly asymmetric in length and apical width (Silveira et al. 2016: Figs. 78, 98).................. 7

7 - Elytra dark-brown, but lateral margins distinctly pale yellow; left half of sternum IX longer than right in ventral view; pygidial keels symmetrical and convergent posterad, subapically indented in lateral view (Silveira et al. 2016: Figs. 67, 78, 73–75, respectively) (Serra da Mantiqueira Mountain Range)............ Luciuranus sinistrus Silveira, Khattar & Mermudes, 2016

7’- Elytra entirely dark-brown, right half of sternum IX longer than left in ventral view; pygidial keels asymmetrical and elliptic ventrad, somewhat straight or sinuose in lateral view (Silveira et al. 2016: Figs. 87, 98, 94, respectively) (Serra da Mantiqueira Mountain Range).......................................... Luciuranus dextrus Silveira, Khattar & Mermudes, 2016