| 1 | Prothorax markedly setiferous both laterally and ventrally, pronotum with 3 long setae on each side | 2 |
| 1’ | Prothorax not setiferous laterally, pronotum with 4 long setae on each side | 4 |
| 2(1) | Head very broad across occiput, wider than pronotum at its widest | Agra risseri, sp. n. |
| 2’ | Head not broad across occiput, narrower than pronotum at its widest | 3 |
| 3(2’) | Elytra constricted at apical third, side margin markedly arcuate | Agra maia, sp. n. |
| 3’ | Elytra barely constricted at apical third, side margin slightly arcuate | Agra ce, sp. n. |
| 4(1’) | Elytra constricted at apical third, side margin markedly arcuate; head markedly narrowed basally | Agra tiputini, sp. n. |
| 4’ | Elytra barely constricted at apical third, side margin slightly arcuate; head slightly tapered yet broad basally | Agra piranha, sp. n. |