Key to Luciuranus species (females only)

1 - Sternum VII as sclerotized as VI (Fig. 99).................................................................. 2

1’- Sternum VII notably more sclerotized than VI (Silveira et al. 2016: Figs. 64, 84, 104)............................... 5

2 - Antennomere III slightly longer than pedicel, pronotum with lateral margins wider than posterior angle (Figs. 95, 98, respec- tively) (Serra do Mar Mountain Range: Tijuca Massif).................................. Luciuranus carioca sp. nov.

2’- Antennomere III 2x longer than pedicel, pronotum widest at posterior angle (Figs. 22, 25, respectively)................. 3

3 - Elytral outer margins dark brown (Fig. 48) (Serra dos Órgãos)................................................. 4

3’- Elytral outer margins pale yellow (Fig. 19) (Serra da Mantiqueira)............................. L. magnoculus sp. nov.

4 - Sternum VIII with posterior margin straight (Fig. 56)....................................... L. desideratus sp. nov.

4’- Sternum VIII with posterior margin emarginate (Silveira et al. 2016: Fig. 44). L. josephi Silveira, Khattar & Mermudes, 2016

5 - Sternum VII posterior margin bisinuose and medially slightly indented, posterior angles acute (Silveira et al. 2016: Fig. 64) (Serra dos Órgãos Mountain Range)....................... Luciuranus jameshooki Silveira, Khattar & Mermudes, 2016

5’- Sternum VII posterior margin straight, posterior angles right-angled and somewhat rounded (Silveira et al. 2016: Figs 84, 104).................................................................................................... 6

6 - Elytra dark-brown, but lateral margins distinctly pale yellow; sternum VI with posterior margin bisinuose, median third round; tergum and sternum VII fused laterally (Silveira et al. 2016: Figs. 69, 84, 83, respectively) (Serra da Mantiqueira Mountain Range)................................................. Luciuranus sinistrus Silveira, Khattar & Mermudes, 2016

6’- Elytra dark-brown; sternum VI with posterior margin straight (Fig. 84); tergum and sternum VII with distinct lateral corners (Silveira et al. 2016: Figs. 89, 104, 103, respectively) (Serra da Mantiqueira Mountain Range)................................................................................. Luciuranus dextrus Silveira, Khattar & Mermudes, 2016