Key to the species of Erythropterus

1 Antennae of males longer than body, segment 3 shorter than 11. Prothorax somewhat rounded at sides, maximum width just behind middle. Meso­ and metafemora with slender clubs, peduncles without carina; punctation shallow, irregular and sparse, more so in mesofemora; hind femora of male exceeding elytral apex. (Figs 1, 2). Brazil (Rondônia) .............................................................. E. cuissi new species

­ Antennae in both sexes shorter than body, segment 3 longer than 11. Prothorax diverging posteriorly from apical margin, maximum width at posterior third. Meso­ and metafemora with well defined clubs, peduncles carinate; coarsely, densely, and strongly punctate; hind femora not exceeding elytral apex .................. 2

2(1) Prothorax entirely black, elytra reddish. Punctation of pronotum moderately deep. Urosternites clothed with very short, moderately dense pubescence not obscuring integument. (Fig. 4). Brazil (Espírito Santo to Rio Grande do Sul), Paraguay, Argentina ................................................................................ E. amabilis Melzer

­ Prothorax entirely reddish, concolorous with elytra. Punctation of pronotum very shallow. Urosternites clothed with longer, dense pubescence, obscuring integument. (Fig. 3). Venezuela ............................................... E. urucuri Martins and Galileo