Key to species of Pteroplatus

1. Posterior area of the elytra without small gibbosities......................................................... 2

- Posterior area of the elytra with small, subcircular gibbosities.................................................. 6

2(1). Elytra reticulated (Figs. 10, 14, 15, 17). Bolivia ........................................... P. anchora Belon, 1903

- Elytra not reticulated.................................................................................. 3

3(2). Antennomeres III–V with long tufts of setae ventrally, and antennomere VI with a long tuft along entire ventral surface (Figs. 18–30). Mexico (Veracruz, Tamaulipas, Chiapas), Guatemala, Honduras, Nicaragua ....... P. quadriscopulatus Bates, 1880

- Tuft of setae on ventral side of the antennomeres III–V moderately short, and antennomere VI with ventral tuft covering or not the entire ventral surface (Figs. 31, 40, 68, 86).............................................................. 4

4(3). Antennomere VII slightly longer than IV (Figs. 31–39). Colombia (Cesar), Ecuador (Loja)........... P. luculentus sp. nov.

- Antennomere VII distinctly longer than IV (Figs. 40, 68, 86)................................................... 5

5(4). Elytra distinctly pubescent (Figs. 40–42). Colombia (Magdalena), Venezuela .................... P. variabilis Sallé, 1850

- Elytra not pubescent, with decumbent setae very sparse (Figs. 43–47). Peru ......... P. pallidicolor Martins & Galileo, 2013

6(1). Small gibbosities of the elytra covering entire posterior half and, usually, following laterally toward anterior third or quarter (Figs. 48–70). Colombia (Boyacá, Cundinamarca, Norte de Santander, Putumayo), and Ecuador (Loja, Napo).............................................................................................. P. pulcher Buquet, 1840

- Small gibbosities of the elytra covering, at most, the posterior third of the elytra (Figs. 71–96). Colombia (Cundinamarca, Boyacá, Quindío, Santander), Peru (Junín)............................................... P. gracilis Buquet, 1840